The Igus WSM-0405-08 part is a miniature linear ball bearing, made from a mix of thermoplastic and filler, along with a supporting lubricant. The WSM-0405-08 offers a low-friction and self-lubricating solution for existing machinery, with very low levels of noise, vibration, and wear. The external diameter of the part is 4mm, the overall height is 5mm and it holds an 8mm diameter ball. It is compatible in environments which reach temperatures of -20°C to +80°C. This part is light weight, low-cost, and ideal for applications which require low maintenance and a long-term reliable performance.