Thick Glass Graduated Measuring Cylinder Set 5ml 10ml 50ml 100ml Glass with Two Brushes If you received broken items, please contact us for full refund or replacement. Thank you!Made of heat resistant borosilicate glass. Heavy duty reusable single metric high quality Wide rim and tapered pouring spout. 3.3 borosilicate glass Wrapped by powerful bubble for keeping the package completely Measure and mix ingredients cylinder set include 2 different size brushes, 3 glass droppers. Small one is for 5ml 10ml 50ml,longer brush is used for cleaning 50ml&100ml cylinders,smaller brush is used for cleaning 5ml&10ml cylinders,right brush is more easier to clean the different cylinders