SKLZ Slice Eliminator From 

SKLZ Slice Eliminator
Get rid of that slice for good. The adjustable guide pads encourage a correct in-to-in swing path for straight shots, and give immediate feedback on an out-to-in (slicing) swing path.

• Provides immediate feedback if swing is out-to-in (slice) or too in-to-out (hook)
• Also provides functionality to guide proper swing plane and help prevent swaying
• Sturdy construction, easy setup
• Fully adjustable for height and guide bar position