I can't believe every dog owner isn't handed one of these with their 1st leash!!!  Goodbye slobber, goodbye getting up to grab the ball that rolls just out of reach, and the Sport 25M uses regular tennis balls (because the ball that is included didn't last more than a day with my dog).  I can just sit on a lawn chair, not having to bend over or get up at all, just wait for the ball to be dropped on the ground, roll where it may, I whack it on the end of the Chuckit, it fits snugly in there, I toss it, & drink my coffee...no grass & dirt & slobber on me at all!!!  Every dog owner needs this!