Use the special screwdriver for children to DIY assembly to exercise your hands-on ability. Flexible joints such as limbs can swing freely by tightening screws. Comfortable grip design, exercise children's hand development. Selection of Plastic materials, strong and resistant to fall, rest assured to play. DIY free disassembly and assembly, multiple parts of the dinosaur can be used in common, breaking the law of circulation to develop imagination. Through the combination of color, shape and structure, children's creativity and imagination can be stimulated. The electric screwdriver uses 2 AAA batteries, and the batteries are not included. Specification: Material: Plastic Size Chart: Tyrannosaurus: 20x7.5x11.5cm/7.87x2.95x4.53inch Brachiosaurus: 19x8x14cm/7.48x3.15x5.51inch Triceratops: 17x7.5x10cm/6.69x2.95x3.94inch Pterodactyl: 19x8x12cm/7.48x3.15x4.72inch Package Includes: Optional:5 PCS: 4 Pieces Dinosaurs 1 Piece Manual Screwdriver 7 PCS: 4 Pieces Dinosaurs 1 Piece Manual Screwdriver 1 Piece Electric Screwdriver 1 Piece Map Note: 1. This is not infant toy , please take away from kids to avoid eating. 2. Please allow slightly error due to manual measurement. 3. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 4. Wish you a wonderful on-line shopping!