6 Piece Graduated Glass Cylinder Set, 5 10 25 50 100 250 ml, KeL Scientific KS-709 Glass cylinders manufactured from borosilicate 3.3 Graduations are printed in brown for easy readablity for accurate measurements Pour spout for easy pouring Numbered graduations are at the 1ml, 2ml, 3ml, 4ml and 5ml Approximate height is 4 3/4inches Approximate diameter of top of opening is 1/2inch(outside diameter) Approximate diameter of roundbase is 1 3/8inches Numbered graduations are at the 2ml, 4ml, 6ml, 8ml and 10ml Approximate height is 5 7/8inches Approximate diameter of top of opening is 5/8inch(outside diameter) Approximate diameter of roundbase is 1 3/8inches Numbered graduations are at the 5ml, 10ml, 15ml, 20ml and 25ml Approximate height is 61/2inches Approximate diameter of top of opening is 3/4inch(outside diameter) Approximate diameter of roundbase is 1 3/4inches Numbered graduations are at the 5ml,10ml, 20ml, 30ml. 40ml, and 50ml Approximate height is 71/2inches Approximate diameter of top of opening is 1inch(outside diameter) Approximate diameter of roundbase is 2inches Numbered graduations are at the 10ml,20ml, 30ml. 40ml, 50ml, 60ml, 70ml, 80ml, 90ml, and 100ml Approximate height is 10 1/8inches Approximate diameter of top of opening is 1 1/4 inch(outside diameter) Approximate diameter of roundbase is 2 3/8inches Numbered graduations are at the20ml, 30ml. 50ml, 70ml, 90ml, 110ml, 130ml, 150ml, 170ml, 190ml, 210ml, 230ml, and 250ml Approximate height is 121/4inches Approximate diameter of top of opening is 1 5/8inch(outside diameter) Approximate diameter of roundbase is 2 7/8inches