Functions: prevent destructive scratching.on furniture wood floor and housing setting protect the pet owner when play with them:never worried you will get hurt or it will destroy you clothing make pet more beautiful and cool and fashion protect silk pet:when it hurt will protect himself or other partner be hurt. Size Guide Info XS - Kitten : (less than 6 months old about 5 pounds \/ 2.5 kg) Soft Cat Nail Caps will fit most kittens by the time they reach the age of 16 weeks (4 months). Some kittens can wear them as early as age 12 weeks (3 months). 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 pounds \/ 2.5kg and\/or 5 months generally fit the kitten size. S - Small : (approximately 6 months old-approximately 6-8 pounds 2.5-4 kg) 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 : (approximately 9-13 pounds 4-6 kg) Most adult average size cats wear medium. L - Large : (approximately 14 pounds 6kg and up ) Very large-boned and large-breed cats wear large. Maine Coons, for example, are very large cats and generally wear large. Instructions:(you can according to these four steps ) STEP 1: Trim the tip of your pet's nails. Trim just enough to allow the nail cap to fit all the way to the base of the nail. FOR KITTENS: Do not trim kittens` claws before applying Soft Paws. You will need sufficient claw surface for the glue to adhere properly. STEP 2: Fill nail caps 1\/3 full with adhesive. STEP 3: Extend nails by gently pressing thumb on top with index finger on bottom of paw -- slide nail caps onto nail. STEP 4: Observe pet for five minutes before release. You can play with your pet or feed some of pet's favorite food to distract for a few minutes. Note: 1. Please compare the detail size with your pet's before you bid. Please choose larger size if your pet's size fall between two sizes. 2. The picture may not reflect the real colour of the item due to different computer monitor and different light brightness. 3. Please allow us some measure error due to hand measurement. 4. The nail caps will fall off with the natural growth of your pet's nails, we recommend that you check your pet's nails periodically.