120mm Dust Proof Dust Filter for Computer Fan Black Features: Colour: Black Dimension: (12 x 12 x 1)cm / (4.72 x 4.72 x 0.39) (L x W x H) Size: Fits over a 120mm fan case Protects your internal components from dust and debris Simple and elegant appearance Durable and practical Package: 1 x 120mm Case Fan Filter "