Manufactured from heat resistant, durable borosilicate glass with graduation marks printed on the body according to ISO 4800. Thick wall and reinforced rim prevent breakage during washing and transportation. Perfectly grinded NS necks with smooth interior are manufactured according to DIN 12242 standard. Volume graduations and inscriptions are printed with white enamel. Supplied with P.E stopper and an interchangeable PTFE stopcock which does not require greasing.