Use this sizing kit to measure each nail. try on each numbered nail tip from the kit on the corresponding finger, starting with size zero or the largest size. The correct size fits the entire nail from sidewall to sidewall without feeling too tight or popping off. Record the size number found on the underside of the nail tip for each finger on both hands, ReplyForwardAdd reactiontake note of each finger starting from thumb to pinkie. Come back to Uphoric website then purchase a set, putting your mesurements in the madatory description box.