This attachment is made with comfortable vegan leather and 10 or 12mm snaps. Please check the diameter of the tops cap (female cap) of your choker to see which size snap extension you should order. Straps are 3/4" wide and can extend most standard chokers to fit up to 19" (adjustable to add 0.5 to 4 inches) Please check that your snaps are the same shape and size as the snaps on this extension. This extension uses fashion spring snaps like most other chokers with snaps, while other types of garments often use different kinds like utility spring snaps or open ring grip snaps that are not compatible with this extension. Snap size can be measured on the outer cap of the female snap.