I am selling this because I accidentally purchased it. The box has been opened to check the product, but it is new and unused. Contents: Balance stones: 11 pieces (red, blue, yellow, purple, orange, green), small non-slip rubber, large non-slip rubber x 2, non-slip sheets x 11, instruction manual (outside the 30-day exchange guarantee period) Style: 11-piece set "For developing your child's physical posture." Comprehensive training is considered appropriate for developing physical strength during the golden age (based on physique, health, and athletic ability). This balance stone is based on the simple concept of jumping between stones in a river, so children won't get bored. It is expected to be effective in developing balance, flexibility, core strength, spatial awareness, and leg strength. "+ Attention and Observation Skills" Children need "attention and observation skills" to avoid danger in natural rivers they encounter on field trips and camping trips. Kenko Hands has added a "+" function, "wobbly stones (which actually don't wobble much when you step on them)," to the play, and has devised a product that allows children to play with it for a longer period of time than conventional products. "Non-slip sheets included" Non-slip sheets are included for children who tend to slip on socks or sweat when barefoot while playing indoors. Please use them if you feel they are necessary. Also, when using them outdoors, try the non-slip sheets when it is raining or when the soles of your shoes are wet. * Please note that the non-slip sheets are consumables due to the nature of the product. "Attention to detail" Various manufacturers sell "balance stones" and "balance boards," but Kenko Hands balance stones are a "set with a pop color variation," encouraging children to identify both colors and shapes while playing. In addition, it allows for non-simplicity by requiring three-dimensional recognition when "putting away," and we are confident that it will provide even more expectations than similar products from other companies. "Target users" Balance stones can naturally improve athletic abilities such as balance while playing, so they are recommended for conditioning training during the golden age.