The Tjernlund CC3p can be purchased at Amazon. Manufactured in entirely in the USA by Tjernlund, a 80-year-old family run sheet metal manufacturer. The CC3P is basically a few cut pieces of commercial grade 304 Stainless Steel. Tjernlund claims to be:

  • Waterproof
  • Fireproof
  • Drop-proof
  • Corrosion-proof
  • Shock-proof

However, it also claims:

“with its three piece, single fit design you can now add a new layer of security: geographic security. Simply by locating each 1/3 of your device in different locations you remove the value and motivation of finding a single piece and exponentially increase the difficulty of your information being compromised.”

I’d be remiss if I didn’t mention that splitting your seed in this manner is actually a bad idea.


The layout of this plate is a bit odd because it claims to be for 24 words, but two of the sets of 3 lines are right on top of the physical breaks, so you can’t really stamp any words there.

Heat Stress Test

Lots of discoloration but no data loss.

Corrosion Stress Test

The acid seems to have cleared off some of the discoloration from the heat testing, but no effects upon the legibility of the stamped words.

Crush Stress Test

The plates bent a fair amount but experienced no data loss.