Set of 20 - ZICOME Bulldog Clips, Magnetic Back, Size 30mm 40mm, 20/Box, Silver Heavy Duty -- High-quality metal clip incorporates a super strong magnet capable of holding up 20 sheets of 20-lb 8 x 11 computer paper Strong Magnet -- Magnetic Grip Display Clips stick instantly to any steel surface and are equipped lifetime magnets Convenient Sizing -- Clip measures: 30mm * 40mm long Easy To Use -- Clip attaches easily and securely to any metal surface Great Helper -- Perfect for hanging photos, displaying notes, and many other home or office uses!