Material Rubber Size 40 Unit (Pack of 1) Style Glue Sterility index Sterile Shape of the Patch item About this item Skin-friendly - Soft to the touch and prevents skin irritation. Comfortable to wear day or night. Waterproof -- Our bands are water resistant and perfect for sports, swimming or in the shower. Dries quickly after shower and leaves no streaks. Hypoallergenic - Medical latex-free material, breathable and comfortable, leaves no residue on the skin. No holes and no glue in the center -- No glue at the sensor, for complete protection and easier change when needed. Outside diameter : 70 mm For perfect attachment of your sensor Easy to use: easy to apply to the skin. Pre-cut paper back, easy to use by yourself, no extra help needed.