Small Size Double-Layer Mask. Levys Straps. General Merchandise. Hal Leonard #GBOM-SMALLBK. Published by Hal Leonard. Made to meet the recommendations set forth by the NFHS' Performing Arts Aerosol Study! This reusable and hand washable double-layer face mask for playing wind instruments helps reduce teh spread of aerosols during instrument play, allowing the instrumentalist to play without having to remove their face covering. If features a cotton flap on the mouth opening with magnetic connections to keep it open or closed and adjustable elastic straps for increased comfort. Made of cotton and polyester fabric.