Reflector Size: 3-1/2" Tall X 4-1/4" WideBase Size: 2" Long X 4-1/4" WideMaterial: ThermoplasticYellow Reflector On Both Sides Is Designed To Mount On Top Of BarriersBase Has 3 Pre-Drilled 1/4" Holes For Mounting Easily, Can Also Be Attached With Adhesive If Desired