Compatibility: Fit with MK10 hotend aluminum cooling block, such as DIY MK10 3D printer, for Creator Pro, for Creator X, for Dreamer, Idea, Builder PowerSpec 3D, Pro PowerSpec 3D X, Duplicator 4S, Duplicator 4X, i3, etc. Brass material advantage: The heat conductivity of brass is 7 times as high as that of stainless steel. MK10 hotend structure only allows filament to have little contact with the nozzle. The material of the nozzle must be brass to filaments temperature is the same as the thermistor, so it make the melt plastic more smooth. But the heat conductivity of stainless steel is so poor, it is unscientific and irrational used on MK10 nozzle; Improved Version: an M3 threaded hole has been added to the aluminum block, making it suitable for both M3 and thermistor; Quantity and specification: 1 piece MK10 hotend kit, it include these parts: 0.4mm nozzle with M7 thread 1 piece, throat with 1.75mm PTFE tube 1 piece, aluminum heater block 1 piece. Material: Nozzle is brass. Throat is stainless steel. Heater block is aluminium alloy. Specification of nozzle: Compatibility:MK10 hotend M7 thread aluminum heater block; Output diameter:0.4mm; Input diameter:1.75mm; Size:M7; Material:Brass. Specification of throat: Compatibility:MK10 hotend M7 thread aluminum heater block, MK10 aluminum cooling block; Filament diameter:1.75mm; Size:lower thread M7, upper diameter 7.8mm; Length:26mm; Material:Stainless steel with 2mmX4mm PTFE tube. Specification of aluminum heater block: Compatibility:MK10 M7 nozzle, MK10 M7 throat, 6mm heater, M3 or thermocouples; Shape size:20mm*20mm*13mm; Material:Aluminium alloy. color:silver Package Contents: 1 piece Brass nozzle 1 piece Stainless steel throat 1 piece 34mm PTFE tube 1 piece Aluminum heater block Only the above package content, other products are not included. Note: Light 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.