The Pearl Championship bass drum is designed with the same formula used to design the FFX snare drum and Championship tenors. Six plies of 100% maple shells offer maximum resonance and huge sub-frequency projection. To compliment the maple shells. 2" wide, 6-ply maple hoops are secured by extra-wide claws for an evenly dispersed pressure for consistent tuning. Lightweight one-piece high-strength aluminum castings and 6 mm case-hardened tension bolts provide uncompromising strength and durability for years of high-performance use. This is the 24x14" version.