Full Grain Leather Dog Collar with Stitching - Hand Made in Topanga, Calif.This dog collar with stitching is made out of natural 11 13 oz premium Hermann Oak English Bridle leather which is naturally tanned using tannins from tree bark (made by boiling the bark in water, just as tea and coffee are made), limestone, and oils from fish and animals. The organic nature of the leather is ideal for a dogs collar in addition to being the most biodegradable of all leathers. We went a bit further with the process with extra sanding