Miyuki is Japan’s oldest seed bead manufacturer. Miyuki seed beads are known for being high quality beads. They are very uniform in size & shape. The holes are larger, than many other brands, allowing for more passes of thread. The Miyuki seed beads working beautifully for bead weaving, beadwork, simple stringing for jewelry & more. The beads are packed in a reusable 5 plastic tube. Matte (MA) - beads are etched for a frosted look. Opaque (OP) - a solid color that does not transmit light. You cannot see through the glass. Size: 6o Size: 4mm. Approximate hole size: 1.5mm. Material: Glass Manufacturer: Miyuki Co, Japan Approximate grams per tube: 20 grams Approximate beads per gram: 12 Approximate beads per tube: 240 Approximate beads per inch: 10 The color name & Miyuki number are in the title line. Example: 6-999. The 6 indicates the size, the rest is the Miyuki color number. The photographs are much larger than the actual items. Please refer to the measurements above for size accuracy. Miyuki Seed Beads 6/0 6-2075 20Grams Matte Opaque Cobalt Blue Glass Beads, Size 6 Bead, Japanese Round Bead