Made of Polycarbonate
With the use of Finger Guards you can protect your fingers while cutting with your acrylic rulers! They are easy to attach and easy to remove, so, you're not stuck using them on just one ruler. For best results, make sure the surface of the ruler is clean and moisten the suction cups before attaching. Finger Guards, Made of polycarbonate, Finger Guards are 25 times stronger than acrylic, Use one on a 12" long ruler, two on a 12.5" square or a 24" long ruler.