LEGO Modulex Pastel Green Modulex Brick 1 x 4 with M on Studs

You can also find this part in at least 7 other colours.

LEGO PART 1121M Modulex Brick 1 x 2 with M on Stud

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1967 Modulex (LEGO) Geography In An Urban Age Educational Planning

UNIVERSAL - Build the ultimate activity table using our compatible LEGO baseplate pieces! Each sheet will work perfectly with other name brand building bricks you know and love. LARGE SURFACE - At 10 x 10 inches, these baseplates provide plenty of space for kids to get creative. The boards are big enough to display several figures, yet small enough to carry around with ease.

Brickyard 10 x 10 Baseplate - Blue