Each is 2x3x3.5" tall robot with built-in key by Yoneya Japan c. 1960s. Both have tin litho bodies with hard plastic feet and soft plastic antennas attached to back. Detailing on both is quite different. The red robot wears a bow tie and has simulated gears visible on chest with additional machinery on back. The mostly silver robot has a pair of dials on chest, tanks on back and has a more comical facial expression where as the other is more robotic. Both work and hop about when wound. Red robot has scuff on bottom of chest otherwise Exc. Silver one is Exc. Neat pair.