There is no limit on the number of letters on this collar but the more letters the smaller they will need to be. New collar made with 1/2"-3/4" black leather strap and dyed leather on the inside. Inner leather is about 1 "-1.25" wide. Your choice color. Has small bondage rings on both sides. Fits 13"-18" . I can make these bigger or smaller to meet your needs. If you want to switch to the crystal letters just include a note in the payment section along with your word choice. Heavy buckle for durability and high quality. -Lockable version does not come with a lock. This listing is for the lockable version but if you want the standard roller buckle version just include that in the payment note. YOU MUST LET ME KNOW WHAT WORD/WORDS YOU WANT ON THIS. If you don't send me a message or payment note stating the word you want the word in the main picture will be used. Gift box: These are really cool little gift boxes that fit our collars. Get any text you want engraved on the top. Box is made with 1/4" Birch plywood and features a heavy duty swing clasp. Just put the word(s) that you want engraved in the customization or payment note section. If you don't see these just message me at the time of purchase. Word(s) on box does not have to match word on collar. If only one word is left in the payment note I will put that on both the collar and the box. Dimensions are 2.25" X 2.25" X 6.75" Leather is matching leather , 6 foot long and has a snap hook on the end.