The basic components of slot machine are reels, the pay line, the payout display etc. Reels are very important for slots, as they are the ones which contain symbols on them. These symbols are spin to check if the player has won or not. These are technically known as stepper reels. A typical machine has three reels but more could be added. Popular machines have three to five reels. Check here for the best slots games in United Kingdom. Machines that possess more than ten reels are called as Big Berthas. A step on a reel is the place where the wheel could stop. Each step consists of a symbol; certain steps could be blank too. Initially reels had only ten symbols, but at present there are many.