Stumps and bases are used when playing rounders and there are 4 of each. Bases are rubber, which sit on the ground weighing down the stumps, preventing it from falling over. The stumps are tall, thin wooden sticks which mark each base in rounders. Running 2 of these on your first hit means you get half a rounder and completing all 4 means you get 1 whole rounder. The batters team are signalled to stay in contact with these so they can not be out. The fielders team usually have fielders on these to get the opposition out. To get them out any fielder has to put the ball on a stump, making contact, whilst the batter is running towards it, of a base.