Thank you for purchasing a Buster Ball! Your new dog toy is hand made in Maine by none other than me. I guarantee that your new Buster Ball will contain a knot and probably quite a few cat hairs. Our careful construction process supervised by a team of quality control officers (cats) guarantees that every Buster Ball will contain one large knot (a monkey's fist, knot #542 in Ashley's Book of Knots) and one smaller compound bend (An English bend, knot #295 in Ashley's Book of Knots)