Repligen chromatography is the premier supplier of low-pressure liquid chromatography columns to biochemical researchers. The available columns range in length from 10 to 200 cm (about 4 inches to 6 feet) and in diameter from 0.6 to 15 cm (about 1/4 to 6 inches). The column bodies are borosilicate glass (generally Pyrex®) and the endplates are made of various plastics.