[for XS Series tubing]:for XS Serious Bowden PTFE tubing with lowest friction on the market. [PC4-M6 and PC4-M10 Couplers]: thread M6/3mm, inner diameter 4mm, fit for the tube whose outer diameter is 4mm, made of premium copper and plastic, sturdy and . PC4-M10 Couplers: thread M10/6mm, inner diameter 4mm, fit for the tube whose outer diameter is 4mm, made of high qulity stainless steel and plastic, high hardness, antioxidtion, anti . The extruder fittings are PC4-M6 and the hotend fittings are PC4-M10. Blue clips fits for PC4-M6 and PC4-M10. [MK8 hotend sock and 0.4mm nozzles]:MK8 hotend socks are also provided to help keep temperatures on the hotend much more stable and this will result in higher print quality and more consistency.0.4mm nozzles of non-stick silicone material Help to keep the hotend temperature extremely stable. [High Quality Silicone Leveling Column and Bed Clip Clamp]: New improved leveling tool for 3D printer hot bed / platform bottom connection. This heat pressure silicone leveling column and bed clip Clamp makes it easier to level your 3D printer. Colour: Blue, Silver, Gold Material: Brass, Metal Package Contents: 1 x for Premium XS Bowden Tubing 1M 1 x Tube Cutter 2 x Blue Clips 2 x PC4-M6 and PC4-M10 Pneumatic Fittings 2 x MK8 hotend socks 2 x 0.4mm nozzles 4 x Black Bed Clips Clamp 4 x Heatbed Silicone Leveling Column Mounts(3 x 18 mm and 1 x 16 mm lower) 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.