This kit includes two flap magnets that can increase the weather resistance of your Endura Flap pet door. One magnet is installed in the channel of the flap under the flap retainer clip and the other magnet with tape is installed inside the threshold. The small magnet is used for the small size Endura flap. The large magnet is used for Medium, Large, and Extra-Large flap sizes. The suggested quantity of magnets is below: