1. Super mathematical instruments for high school 2. 8 pieces in set 3. Size of case 17*8*2.5CM 1.Compasses set Item No.:NC5382.Length of compass:11CM3.Material of compass: Zinc Alloy4.Material of plastic parts: PS5.Content: a metal compass,a 3.5" pencil, a sharpener, an eraser ,and 4pcs ruler set High quality professional compass & math set