The package contains 10 x heat block cotton for 3D printer hotend nozzle insulation 3mm Features - Material: Ceramic fiber heat block cotton for 3d printer. - Color: Yellow 3D printer block. - Size: Approx. 6.8 x 1.8 x 0.3 cm/ 2.7 x 0.7 x 0.12 inch (LxWxH). - keeps the 3D printer nozzle warm and provides better printing effect heat block cotton. - Resistance to thermal shock, low thermal conductivity and heat capacity insulation cotton. - with good elasticity, insulation and small shrinkage. Saves power and energy insulation for 3D printers. - Can work for a long time in high temperature below 300 degrees. Product description insulation cotton It has super good insulation for better printing effect. 3d printer It is for 3D printer nozzle keeping warm. heat block cotton You can design a suitable size to make a hole in the heat block cotton. insulation for 3D printer This item is made of premium ceramic fiber material for durable and practical use