... o Clear, soft, medical-grade silicone. o Seal tight against mouth. o Reusable. Item ... adultsilicone mask ,reusable, size#5, large adultFeatures o Clear, soft, medical-grade silicone. o Seal tight against mouth. o Reusable. Specification1 ... )Material:Medical grade silicone(100% silicone or Liquid silicone) ; 2) the high ...