I believe I am correct in this statement...
"When properly dry these units weigh 16 units or 16 ounces, but when they are wet/need drying they may weight 32+ ounces".
They can be dried and reused many times.
https://www.markpack.com/product-p/10br10a16.htm is what I found on the web.
$5 each
3 for $12
6 for $20
20 for $60
Or make me an offer on more.
Actual shipping cost in any manner you request added to total.
Toss a couple in the gun safe as a back-up.
Toss one in a gun case for long term storage.