Currently, only one species, Trichoplax adhaerens, is acknowledged to belong to the Placozoa. The Italian Francesco Saverio Monticelli described another species in 1893, which he found in the waters around Naples, naming it Treptoplax reptans.
A standard mallet has a head length of 9 to 9.5, and this is recommended for beginners. Expert players may use longer head lengths up to 12, as this is thought to make aiming more accurate and makes it harder to accidentally twist the mallet during the stroke.
Junior (View All Rackets). Kids tennis rackets ranging from 19 to 26 inches in length for players between 2 and 12 years old. As a general rule, the appropriate size racket length for your child is the distance from finger tip to ground when standing upright.