Air moving skates the load movement is smooth and flexible Air moving skates the load movement is smooth and flexible, air bearing rigging systems can be easily works on required floor surface. Perfectly designed for moving in tight spaces. Air bearing casters kits power source is compressed air offer fast, precise, flexible transfer, increase the movement productivity. Air moving skates suitable smooth floors inside or outside doors, and not suitable bumpy and porous floors. Finer Brand Air bearing casters quality durable for more than ten years without quality problems. And our air casters quality warrantied one year, if there have quality problems will renew one or refund. Shan Dong Finer Lifting Tools co.,LTD Email: sales@airbearingcasters.com Website: http://www.airbearingcasters.com