Unlock Your Brain's Potential: Our 12 different metal puzzles are brilliant to encourage kids & adults exercise logical thinking & hands-on ability, improving spatial imagination & creativity. Guaranteed to be highly educational, developing intelligence & brain power, whilst also entertaining at the same time. Mind-Bending Challenges: Each metal puzzle is completely unique, in 12 different designs, ensuring great challenges all round, each time. Instructions are included! Despite its apparent difficulties in solving the puzzles, rest assured that the satisfaction of a job well done makes it all worth while. Relax & destress! Quality Metal Construction: Made from premium quality high carbon steel & electroplated nickel silver, the brain puzzles for adults are solid & durable, making for many hours of concentration & fun! Dimensions per piece 6 x 3 cm. Safety First: Our 12 metal brain teaser puzzles contain small parts & the individual bags may present risk of suffocation caused by inges