THICK DURABLE PU LEATHER - The material of the collar is PU leather. It's thick and strong,but soft ,not stiff,skin friendly the high quality alloy D-ring,it can be attached with dog leashes when walking,training and traveling when out door INDIVIDUALITY SYMBOL AND Bullet SPIKED - This is a personalism age,our friend dogs as well,they need fashion, you will will get many compliments because the good taste of this collar HUMANIZED DESIGN OF 4 ADJUSTABLE COLLAR SIZES - Small 15-18",Medium 17-20",Large 19-22" and X-Large 21-24",Let's together with dogs growth and happy everyday ATTENTION TO NECK SIZE MEASUREMENT - It's really very important for size measurement. Many customers placed orders by wrong size and fall into an inconvenient return and replacement. To save your time and money, please choose a correct size option before you order Enjoy Your Shopping - We're original manufacture so that cost performance of the collar is very outstanding.It worth every cent of your money.Besides,we provide a 60 days quality grantee for you and we value every customer from my store. We want to make money with your satisfaction