The 16.5-inch Mono-Micro Disposable 100% Microfiber Mopping Pad is made of 100% polypropylene microfiber. Triple reinforcement seams and three-layer construction provide durability. Includes an absorbent layer, which holds and releases up to 4 fluid ounces of cleaning solution or disinfectant. The attachment layer easily attaches to any Velcro holder and releases cleanly without lint build-up.