Aluminum 3D Printer Heating Block MK8 Fixing Blocks for Makerbot Extrusion Feature:1. The surface of the product has been specially treated, which is compatible with the extruder and is an ideal substitute for the old model2. The fixed block is made of aluminum, which is sturdy and durable, with excellent thermal conductivity and long service life3. The double nozzle throat fixing block has high efficiency in accordance with strict regulations. The blocks are designed and manufactured in accordance with international standards4. This pack contains 4 pcs. Aluminum heating block, sufficient to meet the needs of users5. Aluminum Heating Block has stable structure, excellent performance and long service lifeSpecification:Item Type: Aluminum Heating BlockMaterial: Aluminum Size: Approx. 87x16x13mm/3.4x0.6x0.5in Packing List:4 x Aluminum Heating Block 1) we accept Alipay, West Union, TT. All major credit cards are accepted through the payment processor's secure escrow. 2) Payment must be made within 3 days of placing the order. 3) If you can't check out immediately after the auction ends, please wait a few minutes and try again, payments should be completed within 3 days. About Shipping 1.