Grover ChromaTone TMB-C4 Seamless Bamboo General Timpani Mallets (Emeral Green) Designed from custom felt to be spherically shaped from the start No need to doctor the core in the manufacturing process by adding layers of adhesive-backed underlayment Grover's vibrantly colored felt is molded to a solid core so that the mallet head will function as one mass By eliminating the need for hand-stitching Grover solves problems such as striking on seams and voids, and the loosening of stitches Grover's manufacturing process eliminates the dead spots that often plague traditional timpani mallets