SRAM's X01 Eagle cassette features the same 10-50t range as it's big brother the XX1 Eagle, just with a slightly stealthier appearance.
SRAM's brilliant X-Dome Technology means that the 11 smaller cogs start life as a single block of cromoly steel and is machined down into the stiffest, strongest and lightest cassette on the market. The 50t Cog is Alumium which helps to keep the weight even lower.
The 500% range puts an end to the argument that you still need a front derailleur on your mountain bike. Updated shifting characteristics mean this shifts better than any cassette before it.
The 12 cogs of the 10-50t are spread out as follows: 10t, 12t, 14t, 16t, 18t, 21t, 24t, 28t, 32t, 36t, 42t, 50t
Only available in Black and will only fit onto a an XD freehub body.