At Eton and Shrewsbury, both schools still have an annual bumping race. At Eton, it takes place over four evenings, in early May. There is usually one boat entered per house, and one boat entered by College. Because of the dangerous nature of the sport, only fours are used, and only the second and third years may row. On the fourth evening there are prizes for the leaders of the chart and also a 'Bumping Cup' for the boat who has made the most bumps over the four nights. The event is marshalled by senior rowers and rowing prefects called "The Monarch". The crew training is mainly pupil driven. Previously races were run every day until there were no more bumps (i.e. until they were nominally in speed order). This historical set-up could lead to weeks of racing and was therefore abandoned in favour of a four-day version more than 100 years ago.