Balance Stones, Set of 11 No instruction manual included Train your core while playing! These balance stones, with 11 stones of varying heights and sizes, allow you to jump between them, naturally developing core strength and balance. You can have fun playing indoors even on bad weather days. I no longer use these, so I hope someone else can enjoy them. When shipping, I will remove the non-slip pads attached to the bottom. As shown in the fourth photo, there is some minor staining. Thank you for your understanding.