Niobium Captive Bead Rings

Niobium Captive Bead Rings 

High polish rings have a titanium ball
Black rings have a hematite ball

Bead sizing: 
High Polish:
18g - 1/4" to 7/16" = 1/8" Bead
18g - 1/2" = 5/32" Bead
16g - 1/4" to 7/16" = 1/8" Bead
16g - 1/2" = 5/32" Bead
14g - 1/4" to 3/8 = 1/8" Bead
14g - 13/32" to 1/2" = 5/32" Bead

Black:
18g - 1/4" to 7/16" = 1/8" Bead
18g - 1/2" = 3/16" Bead
16g - 1/4" to 7/16" = 1/8" Bead
16g - 1/2" = 3/16" Bead
14g - 1/4" = 3/32" Bead
14g - 9/32" to 3/8" = 1/8" Bead
14g - 13/32" to 1/2" = 5/32" Bead