Polystyrene. Reliable memo clip features a heavy duty spring-loaded hinge, magnet on back and rubberized grip. 1.75" H x 1.25" W x 3.375" L View our full assortment of products on our websites: www.Neighborhoodies.com | www.NeighborhoodiesPromos.com. Can’t find what you need? Let us know! We’ll be happy to source products for your project.