Pearl's Superior Shell Technology (SST) on this Export 7" x 8" rack tom uses a combination of strategically arranged plies of poplar and Asian mahogany and proprietary construction techniques to offer you an incredibly durable shell that maximizes frequency response. The Export EXX's Opti-Loc mounting system keeps this tom wobble free and reinforces the resonance of the kit. All of this makes this Export EXX rack tom a high-quality addition for your Pearl Export kit. Pearl Export EXX Rack Tom Pack at a Glance: Superior Shell Technology produces optimal tone, resonance, and strength Opti-Loc mounting is stable and enhances your tone Superior Shell Technology produces optimal tone, resonance, and strength Drummers here at GearNuts swear by Pearl's Superior Shell Technology (we even have a Pearl Endorser in our ranks), a proprietary technique for achieving the ultimate air chamber. First of all, select woods are chosen, based on their unique acoustic