Decade’s 6-ply/5.4mm all Maple shell is what sets it apart from the other players in the field. The final product of ten years of process and material refinement, each cross-laminated ply incorporates Pearl’s proprietary Superior Shell Technology. The resulting thin (but powerfully strong) shell reacts quickly to the stroke, producing beautifully resonant highs and thundering lows. http://pearldrum.com/products/kits/drumsets/decade-maple/#features