Wasters are not without their faults. The all wooden construction usually makes wasters somewhat lighter and differently balanced than steel weapons. The difference of material properties between wood and steel creates a difference in performance when training and sparring. The wood wasters tend to recoil from strong contact with other wasters as may occur in a strong parry or "absetzen", a phenomenon colloquially referred to as "waster bounce". Steel weapons do not display this attribute to the same extent, usually binding and sliding with minimal rebound instead. The use of wooden wasters is somewhat safe as it lacks a cutting edge, but does not equate a safer alternative to steel training swords. The use of wood with rounded edges prevents any cutting injury when sparring but because wooden weapons typically are typically thicker bladed (compared to flat steel training swords like feders) while being of similar weight to steel weapons, they impact much harder than the thin blades of steel training swords (whose weight is concentrated at the hilt rather than the thin blade, compared to the evenly weighted waster). In addition, because of the waster's strong wooden construction, it does not bend at thrusts like feders or some steel training swords. It is for those reasons strong cuts or thrusts to unprotected body parts during sparring may lead to significant blunt force injuries (with the wooden weapon acting like a bludgeon).