Snugly fitting silicone rubber boot. Protects Thermapen ONE from drops to concrete or hard surfaces. Provides protection from radiant heat. Fits Zipper Wallet, Leather Wallet and wall bracket. Use only for Thermapen ONE. Does not fit older models. The silicone boot is translucent. Silicone is not clear nor transparent and so when the protective boot is installed the color of your Thermapen ONE will seem muted.