Here's a nice option for those of you with a Uneekor QED simulator or a GSA simulator requiring a specially marked ball. Put these specially prepared decals on a tour quality ball instead of using the rocks that come with the simulator. Work great. I use 5-6 decals per ball. $40 per sheet of 100 decals. Included are instructions about how to cut them out and for proper placement technique. Watch this video to understand the application process!:
https://www.dropbox.com/s/ntfrhpyqfdnztnn/IMG_7279_Merge%281%29.mp4?dl=1