Well, I guess that rules out depleted uranium ;)
From: STMFC@... on behalf of thecitrusbelt@... [STMFC]
Sent: Tuesday, June 6, 2017 1:49 AM
Subject: Re: [STMFC] S330 or S280 shot blasting media (Liquid Gravity)
Part of an on-line review stated, "I am not sure what metal is used for the tiny little "BBs", but it is not magnetic and after a few measurements I came up with a density of about 4.15 gr/cm3 (lead has a density of 11.3 gr/cm3 for comparison)."
Disappointing that this product provides less weight than an equal volume of lead.