Superior quality 33 expansion borosilicate clear (Type 1, Class A) or Quality products in glass (type 33 glass for clear vials), closures and septa. Glass Sample Vials - Seco.US 39 Product Sample Vial, 1.8 ml, 12 OD x 35 mm H, Clear, Borosilicate Glass, With Black Phenolic Caps and White Rubber Liners, 8-425 Thread Finish,