Maintain the hot end temperature to avoid heat loss. Better to keep the temperature constant and improve the quality. Avoid burns by touching the hot end directly. Keep the hot end clean. Can extend the life of the heating block and extruder by keeping it cleaner. Features - Color: Black, Coffee. - Material: Silicone. - Size: 2.20X2.20X1.30cm/0.86X0.86X0.51inch. - This 3D printer extruder silicone case cover is suitable for most 3D printers. - Professional and practical design with beautiful appearance, easy to carry and use. - Beautiful appearance and sturdy, durable material. Easy to install and carry, small size and portable. - Keep the hot end at a higher temperature, especially for ABS, nylon, or other materials that require a higher printing temperature. - And the silicone cover can also effectively prevent the heating block from being affected by the surrounding wind, improving the prints quality. Package list: 12 x silicone covers