The idea that was selected as the best work in the "Joint Contest" held in 2012 has been commercialized! The joint shape is based on the image of an "open" movement, and it has a deformation mechanism and interlocking movements that are not possible with conventional joints. Joint Size 4 mm (0.16 in). Includes 2 runners - Joint PL x 8 pcs - Joint PR x 8 pcs