I like to hit dried beans. You can front toss them or have the hitter spit and hit them. When you get good, use a easton thunder stick
I first heard about this in an issue of sports illustrated In the '90s. They interviewed a successful rookie with the (dastardly) dodgers. He said when he was a kid his mom didnt have money to take him to the cages so she pitched him beans. I also heard Bryce Harpers dad saying he did the same.
I feel this is good hand/ eye work, also gives you more swings!
I hear parents and coaches alike tell their pitchers to focus on the glove and get frustrated if their eyes wander during their motion. Check out the following shots of Cat:
Occasionally, there has been some discussion about relaxed, open focus. In skeet shooting, I think this is the key. Look at everything with a relaxed focus--not the bead and not the clay--but everything and nothing. Seems counterintuitive, but try it.
DD hasn't done it yet, but I've seen students at FFS's shop do the drill the chrispots posted above. Not sure it it's done with relaxed focus, but looking forward to it.
(Just read chrispots' post completely and totally missed that he's already covered this...)
we use the little soft skills balls, they have blue and red stitching on them. when doing front toss with them (hitting with a broom stick) i will make DD and DS call out the color of stitching. sometimes i will toss two different color stitched balls and tell them what color they have to hit. the kids love these drills.