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The OSLEY Smiling Transparent Mask is made of PET (polyethylene terephthalate). It is elastic, durable, lightweight, portable, and convenient to use. It consumes the least possible resources in production, therefore it is environmentally friendly. Recyclable, the material is airy, non-volatile, and alkaline and acid proof. It can stand temperatures up to 60°C to 85°C.
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