This beautifully crafted set of 12 tactile stones will soothe children's emotions and help them focus on the task at hand. There are six different textures and shapes with two stones per each texture and shape. Made of a unique stone mix with all natural colors, these sensory stones can be used indoors and outdoors. Children will hold, rub, match, or carry as emotional fidgets. These can also be used in loose parts play. The largest stone measures 2.5" tall x 2" wide. The Yellow DoorⓇ Sensory Stones is recommended for children ages 3 years and older.