Slice Engineering Copperhead Silicone Boot At long last, there is an official silicone boot for the Copperhead. And yes, it is a boot, not a sock. Socks can be flimsy, fall off, and tear easily. Boots are there for you when the rubber meets the road (see what we did there?), providing long-lasting protection from cooling air and plastic adhesion. The Copperhead Silicone Boot is: Made from high-grade silicone for higher temperature resistance Thickly molded with internal air cavities to ensure optimal thermal insulation and tear resistance Rated to 290 °C printing temperatures Spring-loaded to keep the boot firmly in place on the hot block at all times Endowed with easy to use finger grips to aid in installation and removal Coated with a clear coating for maximum plastic repellent power Optimized to fit with Slice Engineering nozzles (but will still fit other Rep Rap style nozzles with 7 mm or smaller hex sizes) Protect your hotend investment with the Copperhead Silicone Boot Fits Copperhead Hotends with Copperhead Hot Blocks