The package contains two pedals, two drumsticks, a crossbar, a pair of patches and a drum wrench. There are no instructions in the box. Our double bass drum pedal is easy to assemble. It is smooth and fast, good for beginners and practitioners. Adjustable depending on the spring tension and the height of the beater and pedal. The whisk is double sided. Felt on one side and hard plastic on the other. We provide a drum wrench that makes minor assembly simple and easy to adjust. Installation step: - STEP 1: Attach the crossbar to both pedals. - STEP 2: Tighten the screws. - STEP 3: Adjust to your settings and feel. - STEP 4: Before playing, check all screws and bolts. Make sure all screws and connectors are tight. - STEP 5: Install the double pedal drum patch on your drum. If you are not sure you will like it, you can use some adhesive tape to mount it temporarily if you want to take a test. When the patch wears out, remove it. The adhesive may leave a mark, you can use some isopropyl alcohol to remove the old glue when replacing. The drum patch can help your attack and make the batter's side patch last longer.