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Hop rubber is the sleeve that goes over the barrel and usually has the part that physically contacts the BB. Exception with G-hop, R-hop, ER-hop; the patches sit in the window of the barrel (to make physical contact with the BB) and the hop rubber merely forms a seal around the barrel.
The nub is the bit that goes on the end of the adjuster arm on the hop chamber that applies the pressure TO the hop rubber.
But in the end, flat hop (a naked flat hop rubber with no contact surface inside) and R-hop perform pretty darn close to the same.
The big difference is really whether the BB is hitting a mound or pair of fingers, or hitting a longer flat contact patch to get backspin.
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