Transformers Optimus Basic Construction Set Build your favourite Transformers hero, Optimus Prime, in vehicle or robot mode with this 2-in-1 set of 90 KRE-O construction pieces 2-in-1 KRE-O construction set lets you build Optimus Prime as a robot figure or as a truck Set includes 90 KRE-O pieces Product does not convert Ages 6 to 12.