Building Bricks Block Base Plates - Blue 10 Pack of 5" x 5" Baseplates Tight Fit with All Major Brands 10 packs 5 x 5 inch (16 X 16 studs) blue baseplates ,ABS material Compatible with Major Brands ,Not for DUPLO sized blocks Keeps your creations together ,easy to carry and tight fit.Great for group building. Recommended for age 3 and up. The plates are not affiliated with or endorsed in any way by Lego, a registered trademark of Lego Systems