11 mm Acrylic Transparent Yellow Tri Beads Bulk 1,000 Pieces. We carry a huge selection of Tri-beads of over 30 colors at bulk wholesale pricing. Tri beads are known for their characteristic shape with three arms which allow them to interlock when strung together. The beads are 11mm with a 2mm hole. They come in many colors in opaque (solid), transparent (clear), and metallic. Tri-beads are made from plastic which makes them an affordable craft for jewelry projects including ornaments, keychains and bracelets.