Thanks and was going to ask in that link you sent I presume from the image that the Bottle is steel from the look, would you say it really made a difference if it were carbon wrapped when playing
A cylinder is fibre wrapped for additional strength, this allows thinner metal in the cylinder itself so there is less metal in the cylinder saving weight but more strength as well.
So a fibre wrapped cylinder can take the higher pressure
Though the 3000psi is generaly called a 'steelie' they are realy steel or aluminium, and more often then not probably aluminium
A fibre cylinder is lighter then the equivalent standard one, but it's not realy that much difference (unless it the 'stako' or 'safers' which are different designs and extremely light.
Balance and ergonomics are more important then just weight.
A disadvantage of a fibre cylinder if you are rough and depending on where you play (EG on concrete) is what happens if you bit it on something
Bash a steel/aluminium cylinder and you damage the paint finish, bash a fibre and it may end up scratched. If it's just the finish then it's no issue, if it scratches into the fibres then it won't be bursting in your face at the time but you may end up with a damaged and unusable cylinder - if the fibre is sufficiently scratched then it's a paperweight - the only way to know for sure is submit for testing - and it could be failed on visual inspection.
If flush for funds and you try out the right size & feel of cylinders then go for fibre, otherwise go steelie/aluminium for around. £30/£40 new