These codes refer to the inner diameter (ID) of the aluminum ring, which determines how the drumhead fits within the counter hoop rim of your conga.
For example, in the model number M4-1175-F6-D1, the 'D1' indicates the ID of the aluminum ring—this is the part that sits inside the counter hoop.
This ID sizing system helps accommodate variations in counter hoop rim dimensions across different conga drum manufacturers.
Important: While the crown size (or playing surface) remains the same across all Symmetry Conga heads, the D-code allows for a precise fit based on your drum’s rim design.
Available crown sizes: 9.75", 10.75", 11.06", 11.25", 11.75", 12.25", 12.50", and 13".
(See Illustration B)

Why doesn't my Fiberskyn say Fiberskyn 3? The trademark is officially 'FIBERSKYN®'. During our periodic updates with our imprints and keeping in-line with our trademark registration, all current Remo production of Fiberskyn products have the logo without the number '3'
What's the difference between Fiberskyn, Nuskyn and Skyndeep? FIBERSKYN® provides a superb, authentic drum sound for maximum projection, lively overtones, and slap tones that are easy on your hands. It is the brightest sound of all three Remo film technologies. With superior construction, the low maintenance, weather resistant FIBERSKYN drumheads will enhance your drumming experience. In fact, they are the world’s most widely recorded synthetic world percussion drumheads and are used by most top-professional drummers in the world. It produces ultimate volume with overtones drummers love, and controlled by muting with their hands. LIVELY OVERTONES EASY TO PLAY BRIGHT MID-RANGE TONES NUSKYN® sounds natural, warm, and full-bodied with enhanced low and mid-range frequencies, without any lingering high pitched overtones. NUSKYN® resembles the performance of an animal skin expanding the sound response spectrum dramatically. This means heavy hitting drummers that are accustomed to playing the animal skin will get that same response needing to pull the tone and volume out of the drum. "You know who you are. Manos de Piedra." QUICK DECAY OVERTONES SOUNDS LOOKS & FEELS LIKE ANIMAL SKIN ENHANCED LOW AND MID-RANGE FREQUENCIES SKYNDEEP® is the graphic infusion of pigment into a polyester surface making it uniquely attractive while maintaining the integrity of a great sounding drumhead. SKYNDEEP is weather resistant, producing warm mid-range tones, increases sound, volume and projection similar to the FIBERSKYN without the added fiber layer. This is all around the friendliest drumhead film for hand drummers that want a traditional sound and lifesaving hand care. Playing Skyndeep, you’ll notice your hand velocity is less than playing Nuskyn. This film technology is also very durable during transportation and from the occasional scrapes and bumps. CONTROLLED OVERTONES GRAPHIC IMAGE INCREASED SOUND, VOLUME & PROJECTION WARM MID-RANGE TONE
Need replacement parts: drumhead/lug/tension rod for my Advent Djembe, how can I order them? For Advent replacement parts reference: EN-0810-DJ- ADVENT DJEMBE DRUMHEAD, CRIMPED, 10" DIAMETER, SUEDE *NO CUSTOM OPTIONS FOR DRUMHEAD REPLACEMENT 18-2034-00- PARTS, SCREW, TUNING HOOK, ADVENT DJEMBE 18-0113-00- PARTS, WASHER, TUNING HOOK, ADVENT DJEMBE 16-2069-30- PARTS, TUNING NUT, ADVENT DJEMBE, 5/16" 16-1535-00- PARTS, TUNING HOOK BRACKET, ADVENT DJEMBE *HK-2105-00- ADVENT DJEMBE HARDWARE KIT (includes all PARTS x8 to outfit drum complete) Note: bracket is fixed to shell with pop-rivets...you will need to purchase a screw assembly at your local hardware store if replacement is needed. Please place the special order with your local or online retail store.