Give your pet a warm and comfortable bed to snuggle up in. Just heat the Snuggle Safe in the microwave for a few minutes, then slip it into any pet bed where it will provide up to 12 hours of warmth. The thermapol interior of the heat pad goes through physical changes, resulting in a stable, even, heat temperature of about 120 degrees Fahrenheit. This temperature is warm enough to keep your pet cozy yet safe enough not to burn your pet. Pad is non-toxic, environmentally friendly and never needs to be refilled. Snuggle Safe is ideal for comforting new pets as well as offering therapeutic warmth to older or arthritic animals. 8 1/2" in diameter, 1" thick rigid plastic disk.