3M Or Superior Make Retro Reflective Sheet Type Iv Or Superior. (Letters In Black On Yellow Retro Reflective Sheet Of 600 Mm X 900 Mm). Thickness Of Yellow Retro Reflective Sheet Is 0.3Mm. (For More Details Refer R.D.S.O. Drawing No.- Sdo/S&T/Calling-On B Oard/1030). [ Warranty Period: 30 Months After The Date Of Delivery ] ]