They look like a cat's nail, only hollow

Nail caps are soft plastic nail covers that are glued to your cat's nails.
One of my cats scratches walls and door trims even though I provide plenty of scratching posts around the house. His 2 brothers never do that. I don't want to declaw him but he causes a lot of damage around the house and nothing helps. Has anyone used plastic nail covers and do they work? Are...
Plastic nail covers for cats?
Nail Covers. Soft Paws”™ (or Soft Claws®) are plastic nail caps that can be super-glued to a cat’s claws following a preliminary nail trim. The results are often much more than hoped for, with damage to furniture practically non-existent while the nail caps remain in place. Manufacturers recommend you do a complete replacement every month or so, but most owners simply replace lost nails individually as they fall off, which is a lot less work and expense. . Soft Paws are vinyl nail caps that are glued on to your cat's existing nailsAre cat claw caps cruel, safe, or just ridiculous? - PolicyGeniusFeb 12, 2016 - Cat claw caps are tiny plastic nail caps that you glue onto your cat's claws
Nail caps are plastic nail covers that you affix to your cat’s nails like slipping a glove onto a finger. Originally invented by veterinarian Christianne Schelling of Three Rivers, CA, they obviate the need for declawing your cat. Most importantly, they allow your cat to continue to engage in instinctual scratching and stretching behaviors without damage. NAIL COVERS
A few years ago an excellent product was introduced to reduce damage from furniture scratching humanely. “Soft Paws”™ (or Soft Claws) are plastic nail caps that can be super-glued to a cat’s claws following a preliminary nail trim. The results are often spectacular, with damage to furniture practically non-existent while the nail caps remain in place. The manufacturers recommend a complete replacement every month or so, but replacing lost nails individually as they fall off also works (and involves far less work).It’s these tiny, clear plastic “caps” that are shaped like a cat’s nail, that come with a little adhesive glue to cover the nail. The ad says to first trim the nail (clip off the hook), and then carefully put a dab of the glue into the nail cover, and place it on the nail, while gently holding the cat and nail cover in place a few seconds to be sure it dries in place properly.Behavioral training, nail trimming, and nail caps are all ways to reduce unwanted effects of scratching. There are extensive online resources about training your cat to use a scratching post or similar item instead of your furniture. Offering a variety of attractive materials to scratch (like cardboard or carpet) in different positions (upright or horizontal) is also effective. Make sure that some of these objects are anchored so cats can scratch robustly. Keeping the nails trim is also an important, but sometimes overlooked, step. Of course, some people want a physical block between the cat’s nails and the world. In that case, Soft Paws, plastic caps that are applied to the tips of each toenail, can be applied. Additional options are to cover furniture, use deterrent sprays, or to restrict a cat’s access to certain rooms within the home.You can trim your cat's nails, supply scratching posts, cover your furniture with plastic and still you have cat-scratching problems. What to do? Declaw? Most people are looking for alternatives to this procedure and nail caps are the effective and humane alternative to declawing.If cat-proofing is not possible or the cat continues to use one or two pieces of furniture, you might want to consider moving the furniture, or placing a scratching post directly in front of the furniture that is being scratched. Take a good look at the surfaces of the scratched furniture and ensure that the surface of the post is covered with a material similar to those for which the cat has shown a preference. Some scratching posts are even designed to be wall mounted or hung on doors. Placing additional scratching posts in strategic areas may also be helpful for some cats. Another option is to try using a feline facial scent on scratched surfaces. This may help to reduce scratching at these sites but the cat will still need alternate areas to scratch. Keeping the cat’s nails properly trimmed or using commercially available plastic nail covers are also useful techniques for some owners.