Designed for superior flight this soft-touch plastic flying disc made specifically for nighttime play with your disc-loving dog. It’s not only super fun, its mouth friendly and bite durable with a dog-safe battery cover. It glows brightly, illuminated by a super-efficient, long-lasting Disc-O LED that runs on easily replaceable 2 x 2016 3V lithium batteries (included) and features a push-button on/off switch. Approximately 8.25.