Great Silicone Nano Rings are used to Nano Tip Hair Extensions. The Silicone Nano Beads are safer and more invisible Quantities:1000units per color per bottle Color options: #1 black, #3 dark brown, #5 light brown, #8 brown, #13 beige Size: 2.9mm*1.6mm*2.0mm Warm Note: The color of the silicon nano rings will be a little different under different mornitor.