Mammoth Flossy Chews' Color 3 Knot Tug is natural select 100% cotton. This premium quality knot tug is tightly woven for long-lasting performance and helps remove plaque and tarter buildup from your pets teeth. Tightly woven for long-lasting performance Helps remove plaque and tarter buildup from your pets teeth 100% cottonFlossy Chews rope toys for are manufactured from the finest quality materials at mammoth Pets own state of the art factory.