ITEM NAME:2Pcs Heater Block Protector MK7/8/9 Rubber Socks Cover Instead Ceramic Description: heated aluminum block silicone protective sleeve for MK7/8/9 Temperature up to 280Â °C Color: coffee Material: Silicone Product detailed size: 20*20*10mm Applicable scope: 3D printer Package Includes: 2Pcs Heat Block Sock Cover.2Pcs Heat Block Sock Cover. heated aluminum block silicone protective sleeve for MK7/8/9. Material: Silicone. Product detailed size: 20 20 10mm. Applicable scope: 3D printer.