They go on with an allen wrench and stay on until it's time to take them off. Spikes help keep them on their toes while these solid metal weights are great for ramping up your CBT play and stretching his balls the way they should be stretched!
Medium: 1-3/8" Inner Diameter, Weight 11.4 oz, thickness 3/4"
Large: 1-1/4" Inner Diameter, Weight 18oz, thickness 1"
All dimensions are approximate. Please observe safe rules of play.