If building games such as Lego is one of your favourite game, then you will love these cool building on mugs. As you can see below, there are 3 different colors Build-On Brick Mugs available, red, grey and black. It is BPA free mug with capacity of 12oz. They are compatible with some building blocks such as lego, Pixelblocks, Mega blocks, KRE-O or K’NEX Bricks. What a cool mug. Get one for yourself or make it as a gift for someone special who can not live without Lego.