by keeping minimum shell contact. The heavy-duty SP-70 bass drum spurs offer great stability, while the key style tension rods give you the ability to achieve precise tuning on the bass drum. The 100% poplar Pearl Forum drum shells feature Pearl's exclusive scarf joint (gapless seam) construction for uniform shell vibration, unimpeded by air pockets, for warmth and richness usually found only in more expensive drums.SST (Superior Shell Technology)As with all Pearl drums each shell is formed from their legendary SST construction process which uses extreme heat, precision-cut scarf joints, Pearl's proprietary Acoustiglue, and over 1,000 lbs. of hydraulic pressure to create the ultimate acoustic air chamber.
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