Image Item No. Description  74188c01  Magnet Brick, Modified 2 x 4 Sealed Base with Extension Plate with 2 Studs and Hole 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  2609b  Magnet Holder Tile 2 x 2 - Tall Arms with Deep Notch Catalog: Parts: Magnet