CCB stands for Copper Costing Beads. the body of the bead is made of resin, plastic, or acrylic and then plated with copper. Then other materials (such as silver or gold) can be plated over the top of the copper. This could help with making the jewelry components more cost effective for today's economy 1mm = 0.0393inch Sold Per Set, Exactly The Same As Shown In The Picture Very Good Quality, Detailed And Lovely. All Material Lead Free Free Shipping US Seller Receive within 2 To 5 Business Days