Image Item No. Description By  74188c01  Magnet Brick, Modified 2 x 4 Sealed Base with Extension Plate with 2 Studs and Hole Catalog: Parts: Magnet 40  388c01  Magnet Brick, Modified 4 x 4 Sealed Base Catalog: Parts: Magnet 15  65209c01  Magnet Brick, Round 4 x 4 x 2 with 3 Pin Holes Catalog: Parts: Magnet 372  73092  Magnet Cylindrical Catalog: Parts: Magnet 4  2607  Magnet Holder 2 x 3 with Clips and Pin Hole Catalog: Parts: Magnet 3  30159  Magnet Holder Plate 2 x 2 Bottom with Hole Catalog: Parts: Magnet 5  2609  Magnet Holder Tile 2 x 2 (Undetermined Type) Catalog: Parts: Magnet 122  2609a  Magnet Holder Tile 2 x 2 - Short Arms Catalog: Parts: Magnet 3  2609b  Magnet Holder Tile 2 x 2 - Tall Arms with Deep Notch Catalog: Parts: Magnet 271