Model WS21, Planar Type with Ear-Lops, Specification 17.5cm x 9.5cm This Product is composed of Mask Body, Nose Clip and Mask Straps. The Mask Body is Divided into Three Layers: Inner Layer, Middle Layer, Outer layer. Inner and the Outer layers are spun bond non-woven fabric, and the middle layer is melt-blown non-woven fabric. The Product is Non-sterile supplies.