This bolo tip will accomodate 3mm and 4mm bolo cords. Please be aware that if you are purchasing this as an add on to a bolo, you must make sure that you are choosing the correct cord size. The only cord that will not fit this tip is the 5mm Teal. If that is the cord you want, please explore my other add on options for a great fit. When putting in your bolo specifications, please select either one of the standard tip options. If I see any bolo tip add on like this in your order, I will assume that you would like the tips you have added, rather than the standard tips. Please do not hesitate to reach out to me if you have any questions.