Yes, they are wood stove pellets but can be used for cat litter, etc. Our vet uses them and I did for awhile but my cats didn't really like them. I didn't use them for my little babies but I did when they got older (4+ weeks). The shavings were getting everywhere and driving me crazy. I never had any problems with using shavings or the pellets. It took them awhile to get used to the pellets though. They didn't want to step on them, lol.