Image Item No. Description  65217c01  Magnet Brick 4 x 4 x 1 1/3 No Studs and 2 Pin Holes Catalog: Parts: Magnet  388c01  Magnet Brick, Modified 4 x 4 Sealed Base Catalog: Parts: Magnet  65209c01  Magnet Brick, Round 4 x 4 x 2 with 3 Pin Holes Catalog: Parts: Magnet