Set includes four 4" x 4" polar grid, circle divider magnets.
Place guard on top of your bench block to protect the back of your blanks from that dreaded scuff mark. You will still see a bit of a dent on the back of the blank (because metal has to go somewhere) but it won't be scuffed.
This magnet is thin and hard enough that it should not cause a double impression. However, if you are using hard metal with a detailed stamp, remove the guard and just stamp straight on your block.
You can write on these magnets with a dry erase pen and then it wipes right off. You can also write on them with a sharpie and then remove the ink with rubbing alcohol on a tissue BUT doing this will wear down the print and glossy finish faster over time. Don't use nail polish remover as it's a bit too harsh for the printing.
Household cleaners may remove the print.
These are not meant to last forever. They will break down over a period of time and need replacing.