Insert it between the head cap and head cork and press it with the included felt. The outline of the sound is clearer, it resonates better, and it also increases stability when held. There are 3 types: S, M, and L. S: ⌀14.5 x 10 mm M: ⌀14.5 x 13 mm L: ⌀14.5 x 16 mm [Note] L size may not fit depending on the manufacturer. You may need to adjust the length of the head cork, so please consult your local repairman.
