The lock may seem simple, but it contains many mystery. Easy to dismantle and difficult to reassemble. Not only can it improve your capacity, and it can even be an extraordinary plan. Suit for children and adults. Use your brain, exercise your patience, you can not untie the knot, but while the Master of the structure, it will surely solve it.
Dimensions and Weight
Product weight: 0.0460 kg Package weight: 0.0550 kg