Made of plastic, dust-proof and non-toxic, each pocket comes with a anti-slip cover to protectEntire Size: 27.4cm x 21cm/10.8'' x 8.3''4 sizes: 20 pocket(45mm x 45mm each pocket), 30 pocket(35mm x 35mm each pocket), 42 pocket(29mm x 29mm each pocket), 12 pocket(62mm x 62mm each pocket)Suitable for c...