Potomax WaveTrio Bead - Gunmetal. The exclusive 3-hole WaveTrio nestles perfectly with 4mm beads, allowing you to provide metal edging along projects for a perfect mix of hard and soft. These metal beads are cast in Zamak alloy and plated in premium metals to produce a durable bead that will withstand wear and tear. Have fun exploring all of the creative avenues these unique metal beads offer as components in bead weaving and stringing designs. The Potomax WaveTrio has 3 holes, measures 15mmx3.2mm and comes in a pack of 10.