Explore the exciting world of robotics with the 4M KidzLabs Robotic Hand Kit. Pulling the attached cords cause the hand s thumb and fingers to clench in a realistic gripping motion. No batteries required. Detailed assembly instructions included. Challenge your child s imagination with 4M toys and kits. 4M educational toys cover a wide range of educational subjects and include science kits arts and crafts kits robotics kits and more. Completed hand is about 9 long. Model 3774.