Pencil Pull, Retractable, Holder for Dry Erase Markers for WhiteBoards, Tug-N-Back, No String Tension,  Color May Vary, Assorted Colors, 1 Holder (TNB51-48SWB) Retractable 48" String Holder For Keeping Dry-Erase Marker on Whiteboard Great for Hospitals Office Warehouse Whiteboards and Notice Boards Stick to your whiteboard to hold dry-erase marker hospital and classroom use Office presentations on whiteboards