Material:Bright zinc plated steel Thickness: 2.0mm Model: 1 #, 2 #, 3 # Size: 7 * 7.5, 7 * 11, 7 * 15 cm Name:Auxiliary trackMaterial:Bright zinc plated steelThickness: 2.0mmModel: 1 #, 2 #, 3 #Length:1.5M, 1.8M, 2.0M ,2.5MSize: 7 * 7.5, 7 * 11, 7 * 15 cm Auxiliary track