Bass Drum O's HBL4 - 4" Black Hole Reinforcement System

The Original Bass Drum O's. Easy to install and perfect to customize your bass drum resonant head!

How to install your Bass Drum O's?
1- With a pen, draw the inline of the female ring where you want place the O's on the drumhead
2- Use the Bass Drum O's cutter or a standard cutter and cut the drumhead following the line you drew
3- Wash the head with the provided alcohol swab
4- Place the male ring on the outside of the drumhead after having removed the adhesive protection
5- Remove the adhesive protection from the female part and place it on the male part. Ensure to shove it underneath the edge of the male part, you might use a flat bladed screwdriver. It is done, just simple as that!