This Oldham coupling is made of brass, which reduces friction and has sufficient strength. CNC machining controls the clearance at the connection location. The use of this shaft coupling for the Z-axis screw of the 3D printer will reduce the printing quality problems caused by the swing of the hot bed during the printing process. It is small in size and easy to install and disassemble It protects parts and support bearings It has high torsional stiffness, Good surface finish and service life Item Type: Flexible Shaft Coupler for Z-axis BLV Ender3 Material: brass colour: yellow Package Contents: 2 x Coupling 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.