General Floorcraft relaunched the professional MBL-17 Marble Machine. Need weight? Want to increase efficiency as a professional stone/concrete restorator? The Marble Machine is the only one-piece, solid cast iron apron machine in the world. The MBL-17 is engineered with the weight right from the start. With its exclusive design it weighs 150 pounds. The weight added is not an afterthought here; instead it's built this way.