3M(TM) Vent Tape 394 White, 1 1/2 in x 36 yd 4.0 mil, 24 per case Bulk 3M(TM) Vent Tape 394 White, 4.0 mil (0.10 mm), non-woven, synthetic backing with acrylic adhesive, unique non-woven porous backing that has high air/gas permeability, good burst strength and solids barrier for minimal voids and less clean up 3M(TM) Vent Tape 394, used in a variety of industrial applications including sealing, holding, reinforcing, identifying, masking, protection and splicing