This adapter block is made of copper alloy to maintain high thermal conductivity and thermal stability, and the is nickel-plated to reduce filament residue. It is used for V6 hot end or for Rapido hot end to lengthen the fusing zone for high flow printing design. Support cht nozzle installation. The pro version is designed to provide a longer heated area to provide higher flow on the increased hot end. It is recommended to add thermal insulation cotton after installation and use a 70W heating tube, the effect be the best. Compatible: for V6 hot end for Rapido hot end Colour:Silver Material:copper plating Size:About 23x9mm Package Contents: 2 x for V6 Pro adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.