Replicating the original bass drum hole reinforcement, these have a snap on design.The O’s allow for minimal head removal with more variety in tunable ventilation as well as external microphone access. 6″ Oval shape Black finish Protects your port from rips, snags, and tears Adhesive rings used to hold the Bass Drum O’s in place Alcohol swab included for a clean, permanent application Reviews There are no reviews yet. Be the first to review “Bass Drum O’s 6″ Black Bass Drum Port Rings Oval” Cancel replyYour email address will not be published. Required fields are marked *Your rating * Rate… Perfect Good Average Not that bad Very poor Your review *Name * Email * Save my name, email, and website in this browser for the next time I comment.