Build the ultimate prehistoric beast knexosaurus rex motorised for exciting stomping movement watch his head and tail swing as he moves also builds a second megasaurus model build knexosaurus rex or megasaurus this set contains over 250 knex pieces including a battery powered motor build the model switch it on and watch it stomp to life includes instructions to build the knexosaurus and one other model models can be built one at a time recommended for builders 7 one suppl