The Base Kit was engineered to provide additional headroom as well as stability for the Rion Greenhouses. This base it manufactured with heavy duty 100% UV-protected resin and engineered with a U-shape, honeycomb design for extra durability. Filled with soil this base kit provides a very solid base and it also provides additional 10cm of headroom and growing space. Like all other Rion products, the Base Kit assembles in a snap.