(found in the sidebar of an old article I just read)

Response card, which might be 2″ by 2.5″‘ reads

Yes, I want to start building powerful, granite-hard hands, wrist, and forearms.

I enclose check (or money order) for just $9.95.

Send to me immediately the KARATOK Grip Developer to try in my own home. If not delighted, I may return the KARATOK in 10 days for full refund. No questions asked.

Margrace Corp, makers of the KARATOK Grip Developer, appears to be gone. Hopefully the centuries-old Japanese karate-training techniques it was based on have not been lost.