Thick as copy paper, and about as wide, reds are for the stoner who smokes such weak gear (likely soap bar hash) that paper fumes are an essential chemical component of the high.
Often used by novice, or unskilled smokers, as the size and weight of the paper make it easier for feeble hands.
Only acceptable as a last resort, when too blazed to roll properly, or if you're smoking brambles.
B: "Right then, chuck us some skins, actuate the phonograph, and stick the kettle on Cuthbert"
C: "I've only my trusty reds. Incidentally, Spa just shut."