Air compressor rotary vanes are thin, flat pieces of metal that are used in rotary vane air compressors to compress air. The vanes are mounted in a cylinder and move in and out as the cylinder rotates, trapping and compressing air in a series of chambers. All Mountop compressor vanes are made of durable high-speed steel materials and are designed to withstand the high pressures and wear and tear that is typical in a compressor.