I have always loved baseball, and played it competitively from age 6 to 16. However, I was always a catcher and infielder, never a pitcher. One reason was that I couldn't throw all that hard, but the other was that I could never throw a curveball. Throwing a curve requires a certain grip and throwing motion that I just never got the hang of. So, I decided to make a grip for a baseball that shows a player where on the baseball to grip to throw a curveball. I was inspired by training balls, like the one shown below.