Note: Some cats may not like their new claws at the beginning and try to chew them off, we appreciate your kind patience to stay with your kitty until hee get used to them.Tips for application:We suggest that you have one to assist you when applying. 1.Test size fit or not: Try on the nail cap without glue to ensure a proper snug fit. 2. Make sure fur around the paw are separated from the paw. 3.Trim cat nails and leave sufficient claw surface for the glue to adhere properly.?Kitten don't need) 4.Fill each nail cap a little glue(only cover the nail part), wait the glue half dried, then slide the cap on. (Please be careful and avoid dropping glue on your hands or your cat's fur, if you do, remove it with using nail varnish remover. ) 5. Wait until the glue total dried and begin the next one.Size Guide:XS - Kitten: Fit for 1 lb to 5.5 lb cats Soft Cat Nail Caps will fit most kittens by the time they reach the age of 16 weeks. Some kittens can wear them as early as age 12 weeks. To test, try a nail cap on first without the adhesive. If it looks too big, don't glue it on. The nail cap should fit snugly, like a glove. To accommodate younger kittens, you can trim the base of the nail cap making it smaller so it will fit your kitten's nail. Kittens up to about 5.5 pounds or 5 months generally fit the kitten size.S - Small: Fit for 5.5 lb to 11 lb cats Some kittens at 5 months may need the small size if they are growing fast or are large-breed cats. Small-boned adult cats often wear the small size. If your cat seems smaller than an average full-grown cat, choose small.M - Medium: Fit for 11 lb to 16.5 lb cats Most adult average size cats wear medium.L - Large: Fit for 16.5 lb to 22 lb cats Very large-boned and large-breed cats wear large. For example, Maine Coons, are very large cats and generally wear large.