Flexible tube: 1)Material:pvc, environmental. 2)Mainly used for hematomanometer and etc. 3)Any colour. OEM service. Used for hematomanometer,stethoscope, inflatable bag ... etc.Features:1)Material : pvc, environmental2)mainly used for stethoscopes.3)Color : all colors are available4)Well elasticity,nice ... .If any need, pls don't hesitated to contact us. Flexible tube for hematomanometer