The requested sizes : (we can be flexible on the sizes ) - 12 cm x 12 cm x 12 m - 12.5 cm x 12.5 cm x 12 m steel grade 5sp ps steel grade standard GOST 380-88 C 0.28 0.37 MN 0.50 0.80 Si 0.05 0.30 P 0.04 S 0.05 steel grade 4sp ps steel grade standard GOST 380-88 C 0.40 0.70 MN 0.18 0.27 Si 0.05 0.30