HARD PUZZLES FOR ADULTS – Over 65000 possible permutation, but only 1 right answer to this challenging wooden math brain teaser HANDMADE IN THE USA – Every Safecracker 50 math puzzle is handmade in our Hudson FL shop PUZZLE GIFTS FOR ADULTS – The Safecracker 50 brain teaser makes for a unique one of a kind gift for your mom, dad, brother, sister, grandparents, grand kids, and friends MATH PUZZLES FOR ADULTS – Every Safecracker 50 brainteaser comes with the solution provided MATERIAL AND SIZE – The wooden puzzle measures 5.75” in diameter and is made from high quality maple and cherry hardwoods. Your brain needs a real workout that challenges you and pushes you further! That is why we have designed our brain teasers and puzzle games that will use your cognitive skills to help improve your learning ability, problem-solving skills and short term memory while using specific neural networks and having fun in the tangram puzzle-solving process. Creative Crafthouse takes great pride in providing the absolute best in top quality products. Our wood puzzles adult are designed, handcrafted and tested thoroughly for quality control right here in the USA. Our brain teasers for adults puzzles are one of a kind when it comes to quality, aesthetics, and function. We kept in mind that the foundation of mental exercise is a creativity based on fun learning. We are a small, family-owned, local shop that thrives on your support. We want to provide the absolute best buying experience you can find. Let our team help you out with any questions you may have. Base wheel measures 5 inches diameter.