My dog and my arm thank you for this! Our dog goes crazy when she even sees this coming out of the cabinet! We used to have to throw throw throw with our arms tiring out soooo quickly.  Now, shes the one who gets tired quickly! We have purchased several to make sure we have them for travel/friends houses and they are definitely worth the investment, the ball included is also much stronger than a tennis ball so our dog doesnt destroy them within an hour like normal tennis balls either!