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.
Posts: 9,487. that size mandrel is not big enough for silver cored beads. 3.969 mm is 5/32 and that is the size you use for UN-cored pandora beads. If you add coring to that size hole, it will not fit over a pandora chain. 3/16 is the minimum size to use to core your beads and still have them fit on a pandora chain.