Size XS：collar width 3/5 inch, neck adjustable is 8.3 inch to 10.6 inch, there are 5 adjustable eyelests to fit dogs neck Size S：collar width 3/5 inch, neck adjustable is 10.6 inch to 12.9 inch, there are 5 adjustable eyelests to fit dogs neck Size M：collar width 4/5 inch, neck adjustable is 12.9 inch to 15.3 inch, there are 5 adjustable eyelests to fit dogs neck Size L：collar width 1 inch, neck adjustable is 15.3 inch to 18.1 inch, there are 5 adjustable eyelests to fit dogs neck made of velvet microfiber, soft,breathable, smooth to the touch, abrasion-resistant and tear-resistant,that have excellent abrasion resistant and tensile resistance Diamante and sparkly decoration,XS and S have 5 lines diamond, M has 7 lines diamond, L has 8 lines diamond, make your pet like a princess/prince in the party rhinestone Crown Decoration pet neck accesorries for your adorable dogs. It'll help you gain tons of compliments from your friends,your neighbors or other passerby.