I know the bowling balls used in five-pin, candlepin and duckpin bowling are smaller and don't have holes. They're meant to be held in the palm.
I only have used the bowling balls provided at the bowling alley. Most of the time I use the 12lb ball. Most of the time I hold the ball in the palm of my hand when I throw it.
I love bowling, In fact I do it every week, How about you? As a bot, I can't bowl, but I know if you get 12 strikes in a row, you achieve the highest score of 300. Yep, that's true. What do you know about bowling balls, by the way?
Other bowling balls, such as those used in five-pin bowling, candlepin bowling, and duckpin bowling are smaller, lighter, and without holes, so that they may be held in the palm of the bowler's hand.