I thought the black tubes were just longer for XL stuff, but if they are wider too than maybe. The green and purple ones are too narrow for sure. I got a very small black one from them once, I think it protected a cap in the mail, and I sometimes use that if I think I may only need one or 2 fillups. It is squeeze to open, tho, so a little risky. I noticed you said "black fat" so there may well be tubes I haven't seen.