Quality materials: The dog collar is made of neoprene and nylon, which are not harmful to the dog's health. The high-strength stitched nylon fabric is extremely durable and the collar has a soft neoprene padding on the inside for a comfortable fit. Airtag collar: This dog collar fits the Apple AirTag perfectly and there is no need to purchase a separate holder. It fits the Airtag perfectly and does not come off easily. The Airtag is not included in the package. Whole Package Includes: AirTag Dog Collar x 1. Details: The extra strong reinforced buckle can withstand a maximum tension of 130 kg and does not come off easily. The buckle can be opened quickly and safely with one hand. The O-ring can be easily attached to a leash or carrier and the one-piece design is practical when travelling. Safe and Practical: The reflective strip on the outside of the dog collar reflects light in the dark to keep your dog safe. The airtag dog collars are equipped with a bell whose sound helps you locate your dog more quickly. Sizes and Colours: Our air tag dog collar is available in 5 colours and 4 sizes, perfect for small, medium and large dogs. Colours include: black, blue, orange, green and yellow. Sizes: S: 30-37 cm; M: 37-45 cm; L: 43-50 cm; XL: 48-55 cm. Please measure the dog's neck before purchase.