Our micro vial bottles are made of durable glass with air-tight seal caps to prevent against leakage. The package includes a 36 piece set of 2mL sample bottles and a 6 piece eye dropper set (1ML). Each glass dram is 1.25 x 0.5 inches and 5/8 dram capacity. These clear vial oil drams are perfect for using as essential oil sample vials, anointing oil bottles, specimen jars or as chemistry lab vials. These tiny bottles are also ideal for storing gold nuggets flakes, spices, keepsakes and more.