The stumps and bails are made out of ash and they form the wickets at each end of the pitch.
There are three stumps at each end, with two bails sitting across the top of them.
The stumps are 28 inches high above the ground and are equally spaced to cover a width of nine inches.
A batsman is only run out, stumped, bowled or given out hit wicket when one of the bails is knocked off the top of the stumps.
On a windy day the umpires may use heavier bails, or in extremely high winds, they may choose to play without bails altogether.