Indispensible to have in the toolbox, especially for gigs on unknown territory. Always expect the worse if you don't know what to expect.
The different brands of cymbal stands take the long or short sleeves.
But they can be modified, worn out or damaged, so don't take anything for granted and always pack your toolbox with every item you're ever going to need to properly rest your cymbals on a bald, stripped cymbal stand.
These kind of sleeves are a part of those necessities.
They're can also be convenient if you want to use stackers and need to modify the set up.
Take the short version also.
And don't forget to pack the toolkit with a mini-iron saw that will cut these things the best, as well as felts and a lot of other stuff up and around a set.