From KAT Percussion: "The KT-300 continues the exciting look of the rest of the KAT Percussion line but adds a significant number of features as well as REMO mesh heads. The sensitivity of the pads combined with the REMO mesh heads create a very large velocity curve for the hardest player or the softest touch. Tested to over 1 million strokes, these heads are about as durable as they come. Featuring Dual-Triggering technology, with zones at the head and at the rim, the KT-300s toms provide accurate triggering and a large strike area. The tone changes depending on where and how hard you strike, ensuring the most realistic playing feel." The crashes and hi-hats are 12" and dual zone The ride is 14" and three-zone