Power Fins are a great alternative to the donuts. Just like the donuts the Power Fins fit over the end of the bat and gives you the resistance that you are looking for without forming bad habits. The donuts have a habit of altering a hitters swing.
Power Fins help build swing strength, increase hand/bat speed, and stronger wrists. This is due to increasing air resistance. The amount of resistance would be like swinging a bat in a swimming pool.
I have always used weighted basketballs or donuts for a swing until I came across this tool. This tool is better than the rest. You have the ability to set a hitter up and not have anyone shag the balls or dent a fence because the basketballs are too heavy. This will give more resistance than either of the two.
One size fits all baseball and softball bats, little league, high school, and college.
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