True 4mm - Fits all Official Box Style 66"x910" Futsal Soccer Goals With Depth (Check measurements before buying). Dimensions: 66"Hx102"Wx28"Dx44"B - Mesh Size: 3.5"x3.5". Material: Solid Braid HTPP (High Tenacity Polypropylene ), Color: Yellow. Weight: 2.5 lbs per net. Mesh opening of 12.25" (3.5"x3.5") comply with guidelines for child safety (opening should be less than 16 square inches).