Isotech offers AB Air Bearings that feature a specially shaped stainless steel piston precisely fitted to a borosilicate glass cylinder. This create a true air bearing airflow effect around the piston. As little as 5 psi applied to the cylinder produces a stiff cushion of air that supports the piston and prevents it from coming in contact with the cylinder wall. The AB Air Bearing provides virtually unlimited piston life, super-clean operation, requires no lubrication, and nearly eliminates friction through the use of ultra-low friction ball joints used to connect the rod.