... ,plastic 2.size:15cm straight ruler set 3.OEM /ODM . plastic student ruler set(4pcs)1.material,plastic ... .2.size:20cm straight ruler set ,25g . we also have 20cm , ... 25cm ,30cm,35cm,40cm ,45cm straight ruler set . or we can make according your request . 3 ... pc plastic right angled isosceles triangle, 45°1 pc plastic right angled triangle, 60°1 pc plastic semicircular ...