New Cassette advice

[paulbucknall]

Hi, I am looking at buying a new cassette but am not sure what some of the detailing numbers mean. I would like to buy a Shimano 105 cassette 10 speed but there is a version that's 5600 and one that's 5700, could someone please tell me what's the difference.

[cyclerUK]

The 5700 will be the latest model and maybe a few grams lighter. Shifting and performance wise I doubt that you could tell the difference when riding.
They booth have the largest 3 sprockets mounted on an alloy carrier etc.