"Please Note: Personalized items may only include alphanumeric characters. The no-slip, adjustable-martingale collar is an excellent solution for dogs which easily slip a collar, such as Greyhounds and Dachshunds. The martingale collar is also Ideal for training, Its limited closure prevents the choke from becoming too tight. Includes:1 Collar Intended For:Dogs Collar Type:Training, Martingale, Adjustable Color: Blue Material:Nylon Dimensions:10""L x 5/8""W Personalization Display: You can personalize this product with one line of personalization and up to 24 characters including spaces. If you would like both your pets name and phone number (per the image) be sure to list out both in the text box. Please allow 3 to 4 days for personalization Directions:If you have questions about the proper use of the Martingale No-Slip Collar, please consult a professional trainer. Cautions: Not intended for use as your dog's primary collar. Do not attach I.D. tags or leave on your dog unsupervised Coastal Pet Products Personalized Martingale Dog Collar in Blue, Size: 10""L x 0.625""W | Nylon | PetSmart"