Unique Grip-A-Clip roller automatically adjusts the clip's pitch & angle so that it can hold up to 20 sheets of standard weight paper. Two mounting options: magnetic or adhesive, provide the versatility you need to create message centers nearly anywhere. Go magnetic for file cabinets, lockers & refrigerators, or go adhesive for walls, cabinets & doors. Not for use on painted / papered walls. Either way, these clips have you covered. Clip / Clamp Type: Magnetic Clips; Clip / Clamp Trade Size: Standard; Clip / Clamp Material(s): Plastic; Clip / Clamp Color(s): Gray.