Millerbees Hornet Funnels are selective hornet traps.  The funnel entrance holes are sized to all Yellow legged Hornets, European and Bald-faced hornets enter but not exit.  Most larger insects cannot enter.  Smaller insects "honeybees", can enter but also can exit through holes in the side of the funnels, these holes are too small for Hornets to exit.  There are two sizes Large mouth that will fit large mouth size mason jars with large mouth canning jar ring and regular mouth size that will fit regular mouth mason jar and most plastic mayo jars with a regular mouth canning jar ring.  The canning jar rings are extra.   Trap bait can be 1 part Dark Brown Sugar and 2 part grape juice.  There are many other bait recipes out there, please try them.  Put sticks or other debris in the trap that will float on the liquid bait, so nontarget hornets don't drown and can escape.   Made in USA