C sleeve Linear ways (Maintenance Free) C-Sleeve Linear Way H is a high rigidity type linear motion rolling guide incorporating built in lubricating parts, C-Sleeves, in Linear Way H. Long term maintenance free can be achieved. The lubricant in C-Sleeve keeps the lubrication performance for a long period of time, so that the man-hours for troublesome re-lubrication control can be reduced and maintenance free operation (5 years or 20,000 km whichever comes earlier) can be achieved