Features: brand new and high quality High-quality workmanship, the performance of heatbreak is excellent and it will not be surpassed . "Bi-Metal Heatbreak" It has two components with different thermal conductivity. Its thermal blocking front end is made of for titanium alloy and the back end is made of copper alloy material. It has a strong thermal blocking ability. The smooth surface version of Heatbreak is also the standard size for 3D printers 450-rated Bi-Metal Heatbreak melts filament faster and conducts 60% less heatacross the Break Zone than competing Heatbreaks Specifications: Item: For 3D Printer Heat Break Hotend Heater Block Optional Type:A: V5AC Bi-Metal/ B: V5AC Full-Metal/ C: SE6 Bi-Metal Material: for Titanium & Copper Bi-Metal Total Length : V5AC approx 26mm/1.02in SE-6 approx 30mm/1.18in OD: 6mm ID:1.9mm Thread: M6 Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1 PC x Heatbreak