Features antimicrobial yarns which aid in preventing the growth of bacteria, mold and mildew while reducing odors. Maximum dust-attracting colored 100% synthetic fiber looped-end yarn is sewn into pre-shrunk polyester fabric to allow multiple washings with minimal shrinkage. Yarn contains 25% PET content. Key-hole openings make changing heads easy. Multiple ties firmly secure head to frame. 12 per box.