Unique Grip-A-Clip roller automatically adjusts the clip's pitch and 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 and refrigerators, or go adhesive for walls, cabinets and doors. Not for use on painted\/papered walls. Either way, these clips have you covered.