BS1934 Features: -Brain string advanced. -Puzzle will tie your brain in knots. -Real challenge is untangling the knot in the middle. -Make the puzzle easier or harder based on how much you tangle it up. Gender: -Boy/Girl. Category: -Early Development Toys. Minimum Age Requirement: -8 Years And Up. Dimensions: Overall Height - Top to Bottom: -7.5 Inches. Overall Width - Side to Side: -5 Inches. Overall Depth - Front to Back: -7.5 Inches. Overall Product Weight: -0.5 Pounds.