Our Custom Dog Collars are handmade with a thick but BUTTER soft leather, and feature supple padding.  The crystals are channel set so they are flush with the leather, and have prongs 360° around each center stone, therefore offer a very secure stone and making them very durable for our pooches! The crystals are 3mm/6mm/3mm for a total width of 12mm! SO MUCH SPARKLE! They have heavy duty roller buckles, keepers, and D-rings.