European style flasks have tapered walls with a shallow bottom for more efficient magnetic or mechanical half-moon shaped paddle stirring

These five-neck flasks have three [ST] outer joints and two #7 Ace-Thred necks. The outer joints are tooled with reinforcement rings for added strength and stability. Two of the side necks are in-line with the center neck. The remaining side necks are placed in front of the in-line necks and are internally threaded to accommodate thermometers or bleed tubes up to 7mmO.D. Fabricated from borosilicate glass.