Thompson Center Pillow Ticking Roundball Patches - Pillow ticking was originally designed to be used in the manufacturing of pillow covers. An extremely tight weave 100% cotton fabric was needed to keep the feather quills from poking through the fabric. The U.S. Government went so far as to create a set of specifications that had to be adhered to by vendors who manufactured this material for the military (these patches match those mil specs). Shooters learned long ago that the same properties which existed in pillow ticking were conducive to making excellent round ball patches. The tight weave 100% cotton fabric was rugged, resisted tearing and prevented burn-through. T/C offers pillow ticking patches pre-lubricated with Natural Lube 1000 Plus. All patches are bio-degradable and non-toxic. Uniform thickness assures consistent velocities from shot to shot. 100/ Bag. TIGHT WEAVE 100% COTTON FABRIC RESISTS TEARING AND PREVENTS BURN-THROUGH PRELUBRICATED WITH NATURAL LUBE 1000 PLUS BORE BUTTER BIODEGRADABLE AND NON-TOXIC UNIFORM THICKNESS, 100 PER BAG