Bearings

From Flame Pegasus, Capricorn Strike G, Thunder Pegasus

Weight: 0.040g

From Metal Dragoon Bearing Stinger

Weight: 0.065g

(May not actually be brass, but it looks like it)

From SonoKong Dranzer S, possibly other SonoKong releases.

Weight: 0.245g

From Bearing Gyros Series, Dranzer F, Driger F, Burning Kerberous and Zeus

Weight: 0.243g

Generic MR52ZZ Shielded Metal Ball Bearing (manufactured by NSK in early releases, manufacturer not named later)

Also called Free Bearing, NSK Bearing

From Metal Dragoon Bearing Stinger, Bearing Gyros Series, Wolborg, Wolborg 2, and Burning Kerberous

Weight: 0.200g