[Compatible 3D Printers]: The 12pcs silicone socks are compatible with for A1/A1 Mini 3d printers, please confirm your 3d printer model before ordering. [Stable and ]: The heating block silicone cover is made of heat-, non-stick silicone material that is to temperatures up to 260 degrees Celsius. It can increase the thermal insulation of the 3d printer to avoid excessive temperature fluctuation; it can also insulate the heat to avoid caused by accidental body touch. [High Quality 3D Printer Accessories]: The silicone sock keeps the heater block clean and prevents burning, blackening and buildup of the plastic, thus extending the life of the heating block and the extruder; and helps to keep the temperature at the hot end stable. [Easy Installation]: The silicone cover sock has good flexibility, can be placed close to the heating block, easy to install, without disassembly can be easily assembled to the hot end, stable and not easy to fall off, very strong. Please note:the physical slightly color difference or difference, please do not mind, does not affect the use, thank you! Colour:Black Material:Silica gel Package Contents: 12 x Heater Block Silicone Socks Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.