Features: 1. It is recommended that the safe working temperature be lower than 300 °C. 2. You can pierce or cut for the right size that fits the cotton. 3. Insulation, better insulation heaters and consumables. 4. WAHHING heating block cotton is made of ceramic fiber paper and high temperature film as the main raw material. 5. Excellent quality and durability. Specifications: WAHHING heater block cotton safe working temperature: <300 °C PLA190°C230°C ABS230°C250°C Heating block cotton (<300°C) Package List: 10 * Heat block protection cotton Note: 1. This heater block is working properly and some slight fumes may appear. 2. The color will turn dark brown, black is normal, it won't burn! Please feel free to use! 3. Must pay attention to the safe working temperature of consumables and accessories of 3D printer, otherwise it may cause high temperature hazard!!