Sits on the top of frame in honey box/super under the lid. Extra material as shown in picture to generate bee space between the frame and mat. Mat is pretty flexible and easy to work with. Once it is full of propolis, freeze it and crack propolis out.
Better results can be obtained with match stick between propolis mat and lid. Bees fill mat rather quickly.
Please mention in customer comments for 8 or 10-Frames Hive