This is a New Designed Queen Introduction frame. The old introduction frame you have to take out a frame to us but this New Designed frame you just leave in the hive when you want to introduce a queen simply open the door on top and put the new queen in and leave for a few days and let her out and close the door . Also you could us this for a natural varroa mite control . Find the Queen and put her in along with a few worker bees and wait for 4 to 5 days and let her out this will break the mite cycle.
Shipping wt. 3 lbs.