[Small and Strong]These are small and strong, easy to move. Strong for adults, each can to 15+ A4 sheets or 30+ whiteboard sticky notes. [HIGH QUALITY]The metal magnets are coated with 3 layers of Ni+Cu+Ni, which can greatly protect duty magnets from corrosion and is durable for a long time. [PERFECT SIZE]They are small enough not to cover up what you are hanging. Their ends make easy to hold and move. And they look good. [WIDE APPLICATION]Heavy duty strong magnets for whiteboard can play an important role in many life scenes. Magnetic pushpin magnets are great for whiteboards, refrigerator magnets, office magnets, classroom magnets, and map magnets. When your sticky notes, recipes, and work schedules are nowhere to be found, whiteboard strong magnets might be just what you need size: 12 x 16mm Material: Metal colour: silvery Package Contents: 20 x suction nail Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.