Providence Engraving - Custom Engraved Slide-On Pet ID Tag with Collar - Aluminum Tag, Nylon Collar Includes a strong, durable nylon collar and custom-engraved, aircraft-grade aluminum pet ID tag Complimentary engraving includes up to 4 lines of personalized text on front of tag Slide-on tag mounts directly to the collar eliminating jingling noise and the likelihood of catching on branches or fences Tag is deeply engraved with a precision fiber laser for maximum legibility and durability Available in a variety of colors and sizes to accommodate any pet; Please refer to our product images for a sizing table 12 = 9.5-11.5 neck 14 = 11.5-13.5 neck 16 = 12.5-15.5 neck 18 = 15-17.5 neck 20 = 16-19 neck 22 = 18-21 neck