Yes, it is called a cannonball. It is solid rubber and acts like a giant superball. You can order them at Softball.com
Great ball for this dropball drill and have a riseball spin drill I use this for. Just have to be careful with young non-physically mature girls....the ball is heavy and does create a lot of distraction forces......definitely don't use it as a speed builder for throwing full out.
My DD used it often and loved it. Especially working your drill on her rise.