Notice: For this product,we will send it out via China Post Ordinary Small Packet Plus or Seller’s shipping Method ,the tracking information will update slow.If you need the whole tracking information ,Please Choose China Post Registered Air Mail,Thank You. Size: 250*200*3mm Thickness: 3mm If you need other size, please contact us, we can cut them for you with any size. Description: The heat insulation cotton is used for 3D printer nozzle keeping warm, the heating insulation cotton is made from heat-resistant ceramic fiber, the product sizes can be customized according to customer needs, the benefit for keeping the key parts of the 3D printer – heating aluminum block warm, is making the internal temperature flat, saving power,and energy. This High temperature resistant cotton can work for a long time in high temperature of 900 degree. Package included: 1x 3d printer heating block cottons.