This is a throw-back model of the 1980's BMX pedals from Mikashima, Japan! Originally a BMX model, since being re-issued in 2012, they have been hugely popular for track/fixed gear bikes in Japan. Available in 1/2" and 9/16" axle sizes. The 9/16"axle size will fit 3-piece cranks, such as profile bmx cranks, sugino and shimano track style cranks etc.. The 1/2" will fit 1-piece bent bmx cranks (70's-80's style). These pedals are nice and wide, with a flat-top 1-piece cage design, and jagged edging for good grip. The pedals can be ridden on either side.