4ml Clear or amber Tubular Screw-neck Lyophilized Glass Vials for Medical . 1. Material: low borosilicate glass , neutral borosilicate glass , high borosilicate glass , Soda lime glass . 2. Color: Clear or amber . 3. Specifications: 4ml(16*45) 4. Bottle mouth size :13.7±0.25mm . 5. Provide matching screw plastic cap, butyl rubber stopper. 6.