CMM machine Bellow. Because precision instruments have unique requirements, Gurukrupa India has developed a thin, Polyurethane-coated, Polyester fabric to manufacture CMM bellows. Our special lightweight material is flexible to enable easy thermal expansion and contraction as well as provide general dust protection with minimal drag. Suitable for even the most sensitive, high-precision equipment, our CMM bellows can be delivered with shorter lead-time requirements. To learn how to get started, please contact Gurukrupa India today.