Features: 1. Made of high quality glass, durable, sturdy, lightweight, surface smooth, can be used for a long time. 2. These glass beads are useful as packing for distillation columns and they can also be as boiling stones or mixing beads. 3. High precision glass bead is suitable for chemical plants, pharmaceutical factories, colleges and universities and scientific research units. 4. It is placed in a flask during distillation to prevent boiling of liquid.On the gas absorption device, it ACTS as a buffer to enlarge the gas contact surface or to prevent the page from rushing out directly.In the rubber hose of an alkaline burette, for starting the liquid check valve. Specifications: Name: Solid Round Clear Glass Beads Material: Glass Color: Clear Size: 1mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, 9.5mm, 10mm, 11mm Package Includes: 1000 Pcs x Solid Round Clear Glass Beads Notes: 1. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. 2. Please allow slight dimension difference due to different manual measurement. If you have any questions, please don't hesitate to contact us directly. We will always strive to resolve your issue and delight our customers.