Consists of three-layer sponges; Both sides are made of rough cotton、 a little hard for support and filter impurities; Middle layer is thin but dense for isolating dust
Packing List
1 x Sponge
Dimensions: 9.84 in x 9.69 in x 0.83 in (25.0 cm x 24.6 cm x 2.1 cm) Weight: 0.78 oz (22 g)