DW s flagship line the Collector s Series are the original U.S.-made custom drums. For years drum makers have preferred maple and birch for their resonant tonal qualities. Maple is a traditional shell material that provides low-end punch warmth and attack. This DW Shell Pack features North American maple shells with 3-ply reinforcement hoops. Toms 8-13 are 6-ply while 14 and bigger are 7-ply. Bass drums are 7-ply and snare drums are 10-ply (with 6-ply reinforcement hoops). This shell pack features a floor tom with Vertical Low Timbre (VLT)—a DW special feature which involves arranging grain patterns of shell plies so the outermost and innermost plies run vertically versus the traditional horizontal. This provides less tension on the shell for greater resonance. In addition all toms and kick include X Shell construction which complements VLT technology through a revolutionary full vertical shell cross-lamination on the innerplies. The result of these two advancements is a tonally massive drum sound and lowered pitch. It also features DW s patented STM (suspension tom mount) system which allows drums to vibrate independently allowing maximum resonance while securely holding the drum in place. Because there are no washers or grommets inhibiting the lug rod receiver choking is reduced and tuning is as easy as ever. To give drummers even more control over their sound DW created its patented True-Pitch rod system. The rods feature 5 mm threads rather than the 12/24 that s standard on most other drums. To compare there is one thread every 0.8 mm on True-Pitch rods (about 20% more threads) versus 1 thread every 1.05 mm on most other drums. The result is a more exacting tuning process. Crested by chrome hardware this shell pack features a 13 x9 rack tom 16 x16 VLT floor tom and a 24 x16 kick drum. Snare drum cymbals and hardware sold separately.