Suoyigou Training lock Professional Cutaway Inside view of Practice Keyed locks Training Skill Pick for Locksmith (Padlock) It's suitable for beginnersyou can see clearly that how the pins work when a key is inserted. It will come out in perfect smooth working condition with no loose parts or pins will come out. You actually can see the pins moving up and down as the key slides into and out of the lock. It will be a great gift for players and beginners .We have different color for this lock , you can choose on of them or all of them . thanks