HIGH QUALITY AND SAFE MATERIALS: Sturdy and premium-grade stainless steel, diameter is 4.5mm when other competitors using cheap 3.5mm, so you can't 'cheat' by forcing them open, always keep the shape from bending and breaking. The IQ toy doesn't have sharp edges to keep you and your children safe.
EXCELLENT AND INTERESTING RIDDLES: A fun way to develop kids' critical thinking and challenge adults' minds, helps with practicing concentration and focus.
GREAT STORAGE AND PERFECT SIZE: Each puzzle measures 3 x 2.54 inches that is suitable for you and your children. A thick drawer box package design with one unit for each puzzle makes the puzzles easy to access and store.
CAN'T FIGURE OUT HOW TO SOLVE EACH BRAINTEASER? Instructions are provided along with a picture diagram. It will show you how the pieces are actually suppose to go and they work like magic!
FULL MONEY BACK GUARANTEE - Get it, try it and if you don't like it, NO WORRIES, we provide a full money back guarantee! Order today and reconnect with the greatest generation of this classic toys. The brainteasers is a fun, inexpensive, and unique gift for everyone; grab a few logic games and watch your friends and family have a blast with this timeless, 3D brain teaser novelty they can take anywhere - even on the plane!