Knots Designed for Rugged Use at Sea Will Stand Up to Any Dogs Chewing! These Monkeys Fist Knot Rope Toys are constructed from tough cotton rope; knotted into a heavy ball and attached to a long handle for tugging or throwing. Designed to be a rugged knot for sailors; they’re ideal for aggressive chewers and will really stand up to abuse. The twisted rope helps to clean teeth for improved oral hygiene. Small is red and white and measures 15in L with a 2 3/4in knot. Medium and Large are multicolored. Medium measures 17inL with a 3 3/4in knot; Large measures 21inL with a 5in knot.