The Transfomers AM-21 Arms Master Optimus Prime transforms from robot mode into a semi truck and includes runners to build accessories. This figure features two large mini-weapons which are hidden in its back and deploy in weapon mode and can be used in both robot and vehicle modes. Weapon mode also activates a red LED light inside the figure's torso. Included with the figure is a Shining version of the Arms Micron R.A. which combines with the Matrix to form the colossal Matrix Saber.