I payed 5$ expecting these to be made in Taiwan or China but delightfully surprised they are made in the US of A. went to google how much its worth and couldnt help but laugh at there website saying its good for cheese.
also i payed 5$ for a set but its missing the letter A, G, I, and L which kinda sucks but i can just use my initials for stamping parts.
You would take the stamp then put the object you want to stamp on something solid such as a metal plate or concreate assuming the objects small of course then use a hammer to pound the letter or number in.