The Stip Tip canine artificial insemination tubes come in 4" & 10" sizes. They have a STIP Tip smooth bulb end for less traumatic passage of the insemination tube without complication. The tapered tip also prevents back vacuum of semen when the pipette is withdrawn while the narrow outlet port attached to pipette sends semen further into the uterus. Individually packaged & sterile with flex tip adapter to fit a semen safe syringe.