Vic Firth HeavyHitter QUADROPAD LAMINATES are heavy duty 14 mil mylar shapes that come with a special double-sided adhesive. They can be added to your Quadropad for a more authentic feel and response that will rid you of the side to side drag that occurs when playing scrapes on gum rubber.Because of the easy peal and stick feature, Laminates are a replaceable feature that can be added or upgraded at anytime.