Education Large Stackable Building Baseplates, Compatible with all Brands - 4 Pack 4 units of 10" x 10" Plates in the following colors - Green, Grey, Blue, Sand Custom molded for Guaranteed Tight Fit Plates are not affiliated with or endorsed in any way by Lego, a registered trademark of Lego Systems Easily compatible with Megablocks, Lego, and all major brick sets Underside Connectability so you can connect Bricks from top or bottom