PS plastic ;Ideal for notes, documents or even to seal food bags; Spring-loaded with ribbed plastic “teeth” for a superior hold; Durable rubber grip; Extra-strong magnet on back; Note: Depending on the surface with which these items will be used, it may affect the strength of the magnets and/or its capacity to hold.; Product Size: 1.25″ w x 1.75″ h x 3.5″ d;