referring now to fig1 and 3 , the preferred configuration of a composite club is a bat 10 formed of a core rod 12 , a handle cover 14 and an elastomer sleeve 16 . the rod is preferably ovoid in cross - section . the rod has a handle portion 18 and an upper portion 20 for receiving the elastomer sleeve 16 . the rod 12 is preferably formed of a resin - fiber composite in which the fibers 22 are parallel to the longitudinal axis of the rod . the resin is preferably a resin typically used for resin - fiber composites such as an epoxy , polyester or polyamide thermosetting resin . the reinforcing fibers can be fiberglass , carbon , graphite or a synthetic resin such as kevlar . the handle portion 18 of the rod can have concave sides 24 to ergonomically fit the hand of the user and to preferentially orient the bat 10 with the flatter face 26 of the core rod 12 facing the fish prey . the handle portion 18 of the core 12 receives the cover 14 . the cover 14 can be in the form of a replaceable grip formed of a plastic having a grip pattern such as perforations to increase friction . the cover 14 can be adhered to the rod 12 with a layer of adhesive , not shown . the handle portion 18 forms about 20 - 40 % of the length of the bat 10 , the remainder being composed of the sleeve 16 . the sleeve 16 is cylindrical in cross - section but can taper towards the handle 18 . the upper section 30 of the sleeve 16 is the thickest section since that is the area of the bat which develops the most momentum . the sleeve 16 is at least as thick as the wider dimension of the rod 12 , usually about 11 / 2 to 3 times as thick . the core rod 12 extends almost to the end 32 of the bat 10 . usually the rod occupies from 90 - 95 % of the length of the bat . the end 32 of the sleeve can be rounded to avoid unintended injury to person or property . a fish bat is usually form 18 - 22 inches long , preferably about 201 / 2 inches in length . it can weigh from 24 to 48 ounces , usually around 34 ounces . the lower end of the handle is about 13 / 8 to 13 / 4 inches wide , usually 15 / 8 inches . the oval handle in the long direction has a concave configuration and narrows to a width of from 11 / 8 to 13 / 8 inches , usually 11 / 4 inches . generally the handle cover is about 7 inches long and the elastomer sheath is about 131 / 2 inches long . the core rod is preferably completely covered with handle cover and elastomer sheath . the elastomer sheath has a hardness from 60 - 80 by the shore a test , preferably from 65 - 75 shore a . the elastomer should be inert to the effects of salt water and have good resistance to aging by ultraviolet radiation from ground level sunlight . natural rubber degrades in both sunlight and from the effects of salt water . fish oil and hydrocarbon oil also degrade natural rubber . synthetic rubbers such as neoprene also do not function well in this environment . preferred elastomers are synthetic polyurethanes based on polyols such as ethylene oxide , propylene oxide or polypropylene glycol ( ppg ), liquid polymers or prepolymers . suitable commercially available polyols for forming the elastomer sleeve are adiprene resins such as adiprene l - 100 or adiprene l - 83 . the polyols are reacted with polyisocyanates such as toluene diisocyanate or isprophorone diisocyanate to form the urethane elastomer . the reaction can be accelerated or catalyzed by water activated or heat activated amine catalysts such as moca . referring now to fig4 and 6 , a composite bat 10 is manufactured by preheating the core rod 12 in heating oven 50 to a temperature from 150 - 250 , of preferably 100 °- 235 ° f ., usually around 220 ° f . as shown in fig4 . the preheated core rod 12 is transferred to a mold 52 as shown in fig5 . the rod 12 is suspended by line 56 . the mold 52 is heated to a temperature in the same range as the oven , usually 225 ° f . by means of heater - controller 54 . polyol resin 58 containing diisocyanate and accelerator / catalyst is preheated and mixed in tank 60 to a temperature 30 °- 50 ° f . below the temperature of the mold 52 . the preheated resin 58 is pumped into the cavity 62 shaped in the form of a bat by means of a pump 64 until excess resin exits vent hole 66 . the inside surface 68 of the cavity 62 can be precoated with a release coating such as a silicone resin . after 10 minutes at mold temperature the composite bat 10 is demolded and is post cured in the oven 70 as shown in fig6 for 8 - 16 hours at a temperature of 220 ° f . to 250 ° f . the same procedure and structure can be used to fabricate a billy club 80 as shown in fig7 . the billy club 80 has a cylindrical fiber - reinforced synthetic resin composite core 82 shown in dotted lines , preferably formed by pultrusion and having parallel reinforcement fibers . a cylindrical sleeve 84 of an elastomer having a shore a hardness form 60 - 80 is received on the upper end of the rod 82 . a high friction grip handle cover 86 such as a spiral wound grip is received on the lower end . the end of the rod below the grip 86 may have an enlarged knob 88 to prevent the club 80 from slipping out of the palm of the user during use . a lanyard 90 received through an aperture 92 also aids in holding the club 90 when delivering blows to adversary combatants . it is to be realized that only preferred embodiments of the invention have been described and that numerous substitutions , modifications and alterations are permissible without departing from the spirit and scope of the invention as defined in the following claims .