The quality collar is made more comfortable with the addition of a neoprene inner lining, and secures by means of a double Velcro binding. The collar has two extra D rings, if you want to add weights, rope, or any other accessory you can imagine. This duo features a 35,5 cm chain that splits in two at 20,3 cm, attaching to the collar at a front D ring. Each chain ends at an adjustable alligator style nipple clamp, easily made tighter with thumb screws. Each clamp has a vinyl tip for added comfort and better grip.