These spike beads are all made of acrylic;looks very bright and very beautiful.Many customers maybe will say its material is CCB or metal.In fact ,neither;it is acrylic beads,the quality more better than CCB;and it just looks have metal effect. These spike beads could be used for bracelet,necklace earring ect. Our Spike beads are the best available from China.Wholesale beads from us now !