Following its success in the United States, the Big Putt training aid has been launched in Europe. The Big Putt is a golf ball that is 35% bigger than regulation golf balls, and made of standard golf ball materials. Developed by PGA Tour caddie Mike Hicks, the theory is that practising with the over-sized ball encourages golfers to play a more positive putting stroke, and because the larger ball makes a wider track towards the hole, this is supposed to give golfers more confidence when they putt on the golf courses with a regulation ball. The Big Putt has a RRP of £29.95.