For 3 V3 SE. 3 V3 SE Silicone Socks are made of heat-, non-stick silicone material. Black silicone socks are made of heat- silicone, helps to keep the temperature of the hot end more stable and prevents the heating block from wearing out. It is also non-stick, preventing filament from sticking to the heat block or nozzle and keeping it clean. Strong Heat for 3 V3 SEsilicone sock can withstand high temperatures up to 280C. If the nozzle temperature is higher than 280C, remove the silicone sleeve before printing. 3PCS silicone socks for daily replacement. Silicone sleeve is flexible, can be placed close to the home heat block, solid and not easy to fall off, easy to install. Item Type:Hot end Function: Insulate and protect the heating block. Compatible with for 3 V3 SE 3D Printers Colour:Black Material:Silicone Package Contents: 3 x Silicone case 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.