OliaDesign 6365 Build-On Brick Coffee Mug, 12 oz, Gray 12-ounce capacity. Grey mug with exterior building surface Drink your coffee and build something, too! BPA-free plastic. Hand wash Compatibility: LEGOTM, Pixel Blocks, Mega Blocks, KRE-O, K'NEX Bricks TM This mug does not come with any bricks