Product size: 51-54 MM Function: Supercharge Usage: With a single-layer filter, it becomes a double-layer pressurized clear out Colour: black Material: silicone Size: diameter about fifty three Package Contents: 1 x Gasket Only the above kit content, other products should not included. Note: Light shooting and assorted exhibits could cause the color of the article within the picture a bit of different from the genuine thing. The size allowed error is +/- 1-3cm.