Salt & Mineral Spools
Do not give either of these to your chin. Again, you risk a very high chance of causing bladder stones. Many years ago before I started the rescue, on the advice of a chinchilla breeder I had a mineral wheel in my chin's cage, and he developed a bladder stone. He had to have surgery to have it removed and thankfully made a full recovery. I immediately took the mineral wheel out of his cage, and he has had no problems since. Feeding your chin a healthy diet makes it unnecessary to give them a block of salt/minerals.