1. Upgrade the fixing screws to more firm and not easy to deform. 2. Upgrade the brass radiator, which has better heat dissipation than the A version 3. Upgrade the radiator fixing shaft to replace the radiator more easily. 4. Quick installation and removal: The radiator and the heating block are integrated into a structure, and the back of the radiator is more firmly and conveniently installed and removed with magnetic force. 5. Compatible filament: Supports printing of PLA, ABS, PETG, TPU, PP, PC and other consumables.Warm Tips: After the hot end cools down, do not touch the heating block before disassembly to avoid . Colour:Photo Color Material:Hardened steel + brass Package Contents: 1 x Hotend with 0.4mm nozzle 1 x Silicone case 2 x Wrench(Random Color, don't accept the specified color) 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.