Building Bricks - 10" x 10" Blue Stackable Baseplate (4 Pack) Classic Baseplates Compatible with All Major Brands COMPATIBLE & GUARANTEED TIGHT FIT with all major building block sets. Classic size. GREAT DEAL - More base plates for less money! HOURS OF FUN for kids ages 3 and up. 4-Pack of 10" x 10" baseplates in a bright blue color children will love. Since they are fully compatible with other blocks, (though not affiliated with or endorsed by any of these brands), our baseplate expansion pack offers an affordable way to increase building options! This product meets or exceeds U.S. Consumer Product Safety Commission Toy Safety Standards. LIFETIME REPLACEMENT WARRANTY - Play Platoon stands behind all of its products 100%. If anything ever goes wrong with these, we will replace them with a new set. This product is not affiliated with or endorsed by LEGO or DUPLO. LEGO is a trademark of the LEGO Group of companies.