Material:borosilicate 3.3 glass We specialize in laboratory glassware,main products:beaker,funnel,conical flask,boiling flask,burette,connection tube,test tube,gas washing bottle,separatory Funnel.etc. 1653 Automatic Burette with reservior,grond-in glass stopper and pressure bulbCapacity. (ml)Graduated interval (ml)Capacity of reservoir (ml) 250.12000500.12000