Alesis STRATAPRIMEPACK Strata Prime Expansion PackStrata Prime is an electronic drum kit without compromise. Every detail has been conceived to deliver a responsive and natural experience for the player. Allmesh drumheads have adjustable tension and the 360degree cymbals are free to move and respond like acoustic cymbals. Drums Strata Prime contains all mesh heads. The tension can be adjusted on these mesh heads so you can set the exact level of rebound and expressiveness to your preference and