The pieces can be easily assembled and reassembled to create any imaginable form. This set comes with a screw driver and a wrench.Playtime Ideas:Guidelines are provided in the set. Children will enjoy twisting and turning in order to assemble the parts together as per the guidelines helping to develop fine motor skill, concentration and eye-hand coordination.With even more pieces, this set provides opportunity for children to design and assemble in other designs according to their endless imagination helping to develop their intellectual and creativity. To add more fun, children can play with 30 construction set, Build N Roll, 50Unit Block and Unit Building Blocks.