Beautiful Stainless Steel Slide On Pet ID Tags! This tag slides onto single thickness nylon collars with metal buckles. This tag will NOT slide onto an adjustable collar with plastic snaps. We offer up to 4 lines of personalized laser engraved text. Please follow the ordering instruction below to place your order. Collar is not included. Thank you. *** BE SURE TO ANSWER ITEMS 1 & 2 BELOW *** You may either email us the information through Amazon message or put the following information in the GIFT MESSAGE BOX during Amazon checkout. (1) CHOOSE SIZE: Large Slider (Fits 1 Inch Wide Collars); Medium Slider (Fits 5/8 Inch Wide Collars); Small Slider (Fits 3/8 Inch Wide Collars). (2) PERSONALIZATION includes 4 lines of text with a max of 18 characters per line.