For Use on Silk'n-Edge&Silk'n (Blue&White Unit) The Disposable Lamp Cartridge ensures the fastest treatment speed and the largest treatment size on the market. The lamp cartridge holds 750 pulses which typically cover chest, legs and underarm. For the 3 lamps you have 2,250 pulses. Will fit : Silk'n Edge, Silk'n, Silk'n pro Package includes: 3 Silk'n Edge Cartridges