This is a round bottom flask with 3 neck. The flask is made of good material for and use. The design is simple and elegant, delicately made with workmanship, with stable material and high temperature resistance. Features - Color: Transparent. - Material: Synthetic material. - Size: 11.00x10.50x6.00cm/4.32x4.13x2.36inch. - Made of borosilicate glass and annealed at 800 degree celsius, can be heated directly in an open flame and can withstand typical laboratory thermal variations in chemistry processes. - The design is simple and elegant, delicately made with workmanship, with stable material and high temperature resistance. - Comparing to the single neck or twin neck flask,the 3 neck flasks have one more jointed neck for extra function, when it is not needed, the extra necks can be stopped by head glass stoppers. - The spherical bottom design makes this flask more resistant to vacuum rupture because is evenly distributed across the surface. - Widely used for education, chemistry, research, or applications. Package list: 1 x 3 Neck Boiling Flask