An assortment of borosilicate glass cylinders, all measuring 5 mm high, each with an optically flat polished end to eliminate the need for grease when plating cells.

• Restrict and concentrate the growth of cells
• Heavier than plastic cloning rings
• Eliminate floating
• Seal without grease
• No contamination

This facilitates positioning for observation and improves plating time. Culture cylinders are reusable and autoclaveable.