400 Stainless Steel Mesh T316L is sold in 33cm*33cm pieces, this is food grade mesh used for rebuilding atomizers. This is the highest quality stainless steel mesh on the market. Most users prefer Stainless Steel Mesh because of it's ability to resist burning and scorching.Sold in 33cm*33cm segments. These measurements are an approximation. This will allow you to make multiple SS Mesh Wicks.The 400 stands for 400 holes per inch.