SPECS: Dimensions: 4-1/2 in. x 11-1/2 in. Design & Details: Built from renewable natural latex rubber for environmental cohabitation Gum-massaging surface and intense rockiness of rolling creates erratic bounce Treat-dispenser releases spillage of happy rewards to allow interactive play Inspired by natural volcanic glass formed by rapidly cooling lava from Pacific Northwest Volcanoes with crystal structure Well-suited for large-mouthed dogs with chew-resistant resilient materials Dishwasher safe (top rack) Style: 6073-601