Shimano's Dura-Ace 10-speed Cassette is comprised of an aluminum cog carrier, 4 titanium and 6 steel cogs (from largest to smallest respectively). This makes for a super-light and stiff cassette that makes your derailleur shift like a dream so you can dance up the climbs as easily and efficiently as your chain climbs up and down these cogs.
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with a 10spd 11-28 cassette, a Hubmotor, Lipo batteries @48vdc, & a Mountain drive w/65t chainwheel 0n a Recumbent or mtb you will be flyin for a long ride... Better than a store bought too!