Not only does the Emery Cat not file down cats nails, the fine granules that come off when the cat scratches is harmful to your cat. I've had to take my cat into the vet for an swollen and inflamed inner eye lid. He's an indoor cat so the likelihood of him getting this condition is slim. While rubbing the Emery Cat, I noticed these fine sand granules rubbing off onto my finger...I'm sure this is what irritated my cat's eye. It's now in the trash bin! read full review »