Calling all Kre-o Fans! This rare Kre-o construction set from Hasbro allows your child to switch Sentenial Prime between fire truck and robot mode . This 386 piece set is suitable for 8-14 year olds. It also includes 4 Kreons: Fire Chief, Thundercracker, Soundwave and Sentenial Prime.  Kre-o bricks are designed to work with LEGO brand building blocks.