Feartures: 1. If you want to see all the movement of the pins and springs a clear Acrylic shell is the only way. It is the right practice lock for beginner to know about the structure of a padlock; This is a polished molded shell featuring pins and springs designed specifically for this lock. The result is a very clear view, comfortably hold and realistic lock picking action. 2. This is a Fun Hobby to Learn and Would Even Make a COOL Gift for that Person You Can Never Think of What to Get Them; 3. Small but cute and very cool way to teach kids how locks work; Specification: Material: Acrylic, Metal(Weather proof) Color: Crystal (Transparent) blue Item size: 17.2 x 12.8 x 3.4 cm Net weight: 240g Use: For beginners Teaching & Training tool / Great way to learn Lock Picking Inside package: 1x Padlock 2x keys