Pack of 50 Antique Silver 4mm Corrugated Bicone Metal Spacer Beads. These tiny bicone shaped beads are a great size spacer bead for your next jewelry project. They are an antique silver color which is a darker silver color. These are a metal spacer bead that is made out of zinc alloy. Center hole size is approximately 1.0mm. The outside diameter of the bead is approximately 4mm and they are approximately 4mm thick.