Feature 1Lock with open chambers on all the moving parts that allow you to see how it work. 2With the good lock structure and the stable working conditions, the repeatability is also well. 3You can see clearly that how the pians work when a key is inserted. 4Helpful: Helps you improve your lock opening skills after a short period of study and practice. 5Good toys, Help your children improve their intelligence, practical ability and the great gifts to your friends.Specification Features: Lock with open chambers on all the moving parts that allow you to see how it work. With the good lock structure and the stable working conditions, the repeatability is also well. You can see clearly that how the pians work when a key is inserted. Helpful: Helps you improve your lock opening skills after a short period of study and practice. Good toys, Help your children improve their intelligence, practical ability and the great gifts to your friends. Specification: Lock cylinder: Mental + Acrylic Color: Transparent / Blue / Green / Orange / Pink (Optional) Material: Metal Size: 7.9 x 2.3 x 5 cm / 3.11 x 0.91 x 1.97 inch (appr.) Package List: 1 x Padlock 2 x Keys .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }