LEGO compatible BLUE Brick Building Baseplates, LARGE 10" x 10" 4 pack set 100% COMPATIBLE with all licensed LEGO products including LEGO Classic, LEGO Juniors, LEGO Friends, Duplo. TIGHT FIT! DURABLE: Double the thickness and twice as strong! 4 PACK SET: Each set comes with 4 BLUE baseplates. The square corners fit together perfectly with no gaps; preferred over baseplates with rounded corners UNDERSIDE CONNECTABILITY so you can connect Bricks from top or bottom The plates are not affiliated with or endorsed in any way by Lego, a registered trademark of Lego Systems. Ages 4 and up. Bricks or accessories shown in the picture(s) are not included