Non-lubrication - Special housing and bushing enables self lubrication of piston rod. High quality long service life - Hard anodised aluminium cylinder tubes offer a high resistance to corrosion and low internal friction. ISO-VDMA standard specification Conforms to ISO-6431 and VDMA 24562 specification enabling worldwide interchangeability. Easy to insert reed switch - With four grooves on the tube, proximity and reed sensors can be easily inserted into any position.