The Mars Series Shell Packs offer shallow depth 100% Birch shells complete with the new SONI Clear and trade; Bearing Edge, which increases the contact between the drumhead and shell and allows the head to sit flat on the edge. The SONI Clear and trade; bearing edge produces a stronger and more centered pitch and makes the drums remarkably easy to tune. The drum manufacturing community hasn"t paid a lot of attention to the importance of bearing edges over the years. Specifically, players have had a difficult time tuning their drums and making them sound good because the apex of the edge is too far to the outside of the shell and they can"t get the drumhead to sit flat", states Mike Robinson, Director of Marketing for KHS America. "That frustration, especially for players who are learning the art of tuning their drums, can lead to a lack of enjoyment and less time playing. The SONI Clear and trade; Bearing Edge solves those issues and enables players to get a great sound even without much tuning experience. This is a truly significant breakthrough that all our customers will benefit from. However, Mapex didn"t stop there. They"ve taken design innovations found on their premium line of Saturn IV drums and brought them into the mid-range to enhance the performance of this gig-quality series. The SONI Clear and trade; rack tom suspension system increases overall resonance by preserving vibration in the shell and drumheads and preventing the loss of energy that can make drums sound choked. Shell Pack: 14"X6.5" Snare Drum 10"x07" Mounted Tom 12"x08" Mounted Tom 16"x14" Floor toms 22"X18" Kick Drum