This bundle comes with:

GX 10-50 Cassette - The reliable workhorse of the Eagle Range
X01 118 link Chain - The long-lasting, silver chain of the Eagle lineup. 

`Chain stretch' is simply the accumulated wear of chain rollers. This introduces free play between chain links and causes the links to move apart from each other. 

X01 and XX1 chain rollers are chrome-plated, which substantially reduces roller wear. They are 3x as durable as GX chains - so the chain/cassette wear ratio becomes roughly 1:1. 

Cassette:
Model name: XG1275, XG-1275, XG 1275
Weight: 450 Grams
Ratio: 10-50
Colour: Black
Suits: XD Driver (Will not work with upgrade from SX or NX cassette)

Chain:
Model name: X01
Links: 118L workshop
Powerlinks: Rainbow coloured
Please note that this chain is a 118 link chain, which fits the vast majority of non high-pivot bikes. Please check carefully before ordering.