Heater block silicone socks are suitable for 3 V3 SE, for 5 S1 and for 7. for 3 V3 SE silicone socks are made of heat- non-stick silicone material. The black for 5 S1 silicone socks are made of heat- silicone, which helps keep the temperature of the hot end more stable and prevents wear on the heating block. It is also non-stick, preventing filaments from sticking to the heat block or nozzle and keeping it clean. [Strong Heat Resistance]for 7 silicone socks can withstand high temperatures up to 280°C. If the nozzle temperature is higher than 280°C, please remove the silicone cover before printing. 5 pieces of silicone socks, suitable for daily replacement. The silicone cover is elastic and can be placed on the heat insulation block near your home. It is sturdy, not easy to fall off, and easy to install. Colour:Black Material:Silicone Package Contents: 5 x 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.