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.
  a badminton raquet is the peice of eqiupment that people (that are playing badmintom) use to hit the birdie/shuttlecock.  - Chow. badminton racquet sizes is never over the size of 680mm in height and 230mm in width.