The Rhinestone Personality Collection is made of high quality leather designed for great looks, and to be used as an everyday collar. Each collar can be customized by you with our bling bling rhinestones. Just slide it on and put the belt in place; it can be done in less than a minute! Sizes: XSmall 7-9.5" L x 1/2" W, Small 9-12" L x 1/2" W, Medium 11.5-14.5" L x 3/4" W, Large 14-18"L x 3/4" W, and XLarge 17.5-21.5" L x 3/4".