Extra durable with 2 layers of nylon webbing. Doubling up on the webbing make them last longer and it also makes it so we can use black on the inside while having your color choice on the outside. This process helps make the color stay brighter and more colorful far longer. Extra dense embroidery for long lasting good looks. While increasing the density may take longer it also makes for a far richer and longer lasting embroidery design. 9 Multiple Collar Colors: Black, Purple, Pink, Blue, Red, Orange, Green, Yellow, Brown and 11 Thread Colors: White, Grey, Red, Orange, Green, Yellow, Light Blue, Blue, Black, Pink, Purple. 4 Different Sizes: XS : (8-12') x 5/8'; S : (10-16') x 3/4'; M : (14-20') x 1'; L : (16-24') x 1'. Good for puppies, adults, large and small dogs. You can switch/choose between sizes and colors by clicking on the buttons and customize your text and thread collor by clicking on 'Customize Now' at the top right.