KRE-O Transformers Kreon Battle Changers Series Collection 1 Autobot Bumblebee Build it, then convert it from robot to vehicle! Once it is built, it is a real working transformer. You do not need to take it apart to transform from robot to vehicle and back again. Collect all 4 Kreon Transformers: Bumblebee, Grimlock, Shockwave, Autobot Hound, (each sold separately). Pieces also work with all major building block brands. Ages 6 and up.