Synchronous wheel--easy to use. super practical accessory for 3d printers.capabilities, Idler Pulley for Timing Belt; Timing belt idler pulley--2gt timing belt pulley with 5mm bore and 6mm belt width, 20 teeth, Aluminum Alloy Idler Pulley; 20 teeth idler pulley-- choice for building a 3d printer or similar projects, 5mm Bore Idler Pulley; Aluminum idler pulley--bushing design is much more convenient to install and disassemble, 5mm Bore Idler Pulley; 5mm bore idler pulley--2gt timing belt pulley system especially suited for linear movement, for 3d printer 6mm width belt, Synchronous Wheel

What's in the box
5 x 3D Printer Accessories