Craft with silicones, strong magnets, Could directly attached to metal surfaces such as refrigerators, whiteboard, lockers, clipboard, cabinet. Each pen holder features doubl ended silicones rings make marker pen more stable and perfectly fit various pen size. For strongest attraction, please that the more area of pen holder is adsorbed on the metal surfaces and sheet. Widely used on most smooth item and easy to remove. Suitable for refrigerator stickers, fixed charging cables on desk, organizing , and other item weighing. Package includes 4pcs pen holder; 4pcs round sheets. Perfect for organizing essential, such as scissor, , USB cables.