Feature: 1. Ability Development: Interesting toys with mysterious appearance and various clever designs, help develop your creativity, observation, space, reasoning and memory. 2. Logical Thinking: In the process of unlocking, players need to observe carefully, think carefully and analyze and reason. Cultivate logical thinking and independent thinking skills. 3. Hand Eye Coordination: Unlock puzzle toy helps train eye and hand coordination, problem solving skills and expand thinking. At the same time, it is the perfect way to relieve stress, keep the brain focused and hands busy. 4. Portable Design: Perfect and thoughtful gifts for loved ones, family, relatives, friends, etc. on birthdays and Christmas, etc. Easy to carry, suitable for home and office. 5. Alloy Material: Unlock interlocking puzzle adopts excellent alloy material, eco friendly, firm and sturdy, anti rust and stable, no deformation, durable for use. Specification: Item Type: Metal Unlock Toy Material: Alloy. Package List: 1 x Unlock Toy