Vic Firth Heavy Hitter Laminates can be added to the pad for a greater articulation and better simulation of the response and feel of a marching drum. Vic Firth Heavy Hitter Laminates are heavy duty 14 mil Mylar discs that come with a special double-sided adhesive. Simply peel off the backing‚ and apply to the Vic Firth Heavy Hitter pad of your choice. Because of the easy peal and stick feature‚ the Laminate can be added‚ replaced or upgraded at anytime.