STRICKLT BRIKS Compatible with Lego Toy Building Block - Stackable Baseplates 10" x 10" Brik Tower for Ages 5 Years and Up, 6 Baseplates & 50 Stackers in Blue Green & Gray, 56 Pieces. This 56-piece set features six 10" x 10" stackable baseplates in blue, green, and grey, fully compatible with all major building bricks.
eBay