Special Herbs, Vols. 4, 5 &amp; 6 is an album of instrumental works released by MF Doom under the Metal Fingers moniker. As with the other installments of the "Special Herbs" series, each track is named for a herb (or similar flora) or herbal preparation, with the exception of "Coffin Nails" which could refer either to a slang term for tobacco cigarettes or literally to nails from coffins, which have been traditionally used in conjunction with certain herbs in the performance of ceremonial magic rituals.
The album's title is slightly misleading, in that it is not an entirely new volume: the second part of the previous installment in the Metal Fingers series (confusingly also called "Special Herbs, Vol. 4" but also commonly known as "Special Herbs, Vols. 3 &amp; 4"; it is this latter "Volume 4" that is duplicated), appears again here as the first eight tracks of "Vols. 4, 5 &amp; 6". The difference in record labels on which the various albums were released explains this anomaly, similar to the earlier doublings of "Vol. 2" and "Vol. 4". After this volume, the numbering of the series becomes more consistent, and there are no such overlapping tracks.
The original artwork for both the CD and vinyl versions contained depictions of Marvel Comics' Doctor Doom character (from the Fantastic Four). The original album with this artwork is now deleted but can surface from time to time on online auction sites. An updated cover was created for the album featuring MF Doom's own face.