Introducing the Tractive Mini Fastener for Cats and Small Dogs. This Fastener attaches to any collar up to 1 inch with its innovative J-Clip design and even works on no clasp martingale style collars. The Tractive unit snaps in securely and can be easily removed using a pencils eraser end through one of the two 8mm holes to push it out. The spaceage tough plastic is a special blend with an added elastomer which allows it to bend but always returns to its original form. As with all of our products this fastener is made in the USA and is warrantied for Life!