The Curvy Copter plus (or Curvy Copter Extra, as it is named in Tom's Shapeways shop) is an evolutionary development from the "normal" Curvy Copter, having the four inner pieces each cut in two halves, which allows additional jumbling moves. Meanwhile this puzzle was mass-produced by Meffert's in a very good quality. Size: edge length 5.7cm standard cube size Weight: 77g Meffert's CC+: Size: edge length 5.7cm Weight: 155g