"PRECISION" STEEL SHIM STOCK Width: 6" Length: 100" Type: Shim-Plain Packing Type: Roll Material: 1010 Steel Thickness: 0.0030" Hardness: 90.0 Rb [Min], 100.0 Rb [Max] Thickness Tolerance (-): 10.00000% [Max] Thickness Tolerance (+): 10.00000% [Max] Tensile Strength 80000 psi. Cold rolled, stiff low carbon material.