Specification and Dimensions: Woven Wire Mesh Stainless Steel 400Mesh 400 holes per liner inch Wire diameter: 0.03mm Aperture: 0.034mm(34 micron) Open Area: 27% Weave Type: Twill Weave Material: T316L grade Size: 12"x12"(30cmx30cm) Quality: the mesh is very flat and clean, no burrs and fold. Material can easily bend by hand and cut with scissors and commonly used for filters and laboratories. Packing: first tight and rolled with waterproof paper, then outside wrapped tightly with bubbled plastic film, finally put the roll into a shipping tube. (If you have special request, we can put the tube into a wooden case.)