High-performance yo-yo string with a "grip guard" sleeve to protect your finger from injury during play. At the time, there was a pending patent assigned to this product. However, I could not find if the patent was officially issued.
The blacked out portion on the back of the card read, 800-525-YOYO www.yoyozone.com
Of interest... Over the years yo-yo makers have tried various methods to alleviate "Yo-Yo Finger" -- the pain caused by prolonged wear of a yo-yo string around your finger. Here are a few variations that have appeared on the market since the early 1980s:
