Stone Type:Terahertz Beads Hole Size:Approx 1mm Beads Size Quantity: 2mm:about 94pcs/strand 3mm:about 64pcs/strand 4mm:about 40pcs/strand 6mm:about 30pcs/strand 8mm:about 24pcs/strand 10mm:about 20pcs/strand 12mm:about 14pcs/strand Beads Shape:Round Shape Package Included:1pc Strand beads Note: 1.Due to different producing batches,product details might be a little different. 2.If you minding the difference, please buy it carefully. 3.Please allow 0.1mm-1cm differs due to manual measurement. 4.Due to the different display and different light, the picture may not reflect the actual color of the item. 5.Thanks for your understanding. Terahertz quartz is a fascinating type of silicon gemstone that is silver metallic in appearance and it refreshing in its lightness. Those who swear by it believe it helps with concentration, mental clarity, brain fog, tiredness, burnout and focus.