"Using the Impact Improver is simple – slide the “Strike Shield” over your club face and hit the “Impact Balls.” That’s it. Couldn’t be easier.
I slid the Strike Shield over a number of different types of irons and wedges without issue, but a “Facilitator Tool” is included if you have problems getting the shield over a thick top line."
To read full article: https://pluggedingolf.com/fighting-golf-impact-improver-review/