Plastic Bearing

POM Bearing

Brass Bearing

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

From SonoKong Dranzer S, possibly other SonoKong releases.

Weight: 0.245g

Metal Bearing

Shielded Metal Ball Bearing

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

Bearing Line-Up