The Goughnut Stick was made to be safe and durable. Creatively designed, this chew toy blends fun and safety in a unique way. Each Goughnut toy includes a patented safety indicator where green means, 'Go Nuts!' and red means 'Stop!'. The Goughnut Stick is made entirely from rubber here in the USA. The design was carefully created and tested to ensure that the hazards that other dog toys have are addressed. The GREEN STICK - The 9 inch length and 1.75 inch cross sections are optimal to distribute force evenly across the toy. The Extreme Goughnut BLACK STICK is also 9 x 1.75 but infuses carbon technology to increase toughness for extreme chewers. The MAXX STICK has a 12 inch length and is 2.1 inch cross for your TOUGHEST CHEWERS! All the Goughnut STICK products employ physics to reduce the powerful leveraging force a dog's jaw can exert. These elements ensure a durable toy. Perhaps most importantly, the Goughnut Toys all have an embedded red safety indicator. Even if your dog is able to chew into the toy, the red core serves as a visual indicator that the toy has been compromised and should be removed. If this happens, the toy can be sent back to the manufacturer and it will be replaced for free! Truly a remarkable standard in dog toys, Goughnuts stands behind every one of its products with its Lifetime Guarantee. Try a Goughnut for your dog. It will undoubtedly be its favorite toy and the ONE toy they own that will last indefinitely. We're sure you and your dog will 'Go Nuts' over Goughnuts!