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All Yamaha wood drums have one thing in common. Our craftsmen create every drum shell using our exclusive staggered diagonal seam, Air Seal System just as they have since 1967. Each two or three-ply master ply is cut to length to very precise tolerance with a diagonal cut on each end. The diagonal seam in the drum shell will not separate, eliminating the need to fill gaps in the bearing edge with filler putty. These plies have glue applied and are then put into the mold by hand, one master play at a time. The craftsman then inserts an air bag into the mold and inflates it, clamping the shell with even pressure 360 degrees around. This process creates a shell that is strong, starts round, and stays round for many years.
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