I have both the Gibraltar packs and the felt that you buy at the fabric stores. The felt from the fabric stores works out fine for me. I can vary the width to suit the size of the bass drum's head. I usually use a 3 1/2" for my 22" and a 2 1/2" or 3" for the 20". I've had one on the DW Classic bass drum for about a year and a half and I just installed a felt strip on the resonant head of my Ludwig 20" Classic Maple kit. Felt strips are more or less a lost form of mild bass drum muffling that can achieve superior results to many other methods. Some even use the strips on both the resonant and batter heads.