I calculated the mass density of a pin made out of AISI D2 Tool Steel 2.000" in length, with and OD of 0.792 and an ID of 0.707 (0.085" wall thickness) and used 0.278 in/lbs3 as mass density factor and came up with 25.3 grams each, again these are 2" long pieces.
http://www.matweb.com/search/datashe...d=16009&ckck=1