The Go Sports pure putt challenge putting cups are game changing training aids for practicing your putts anytime & anywhere. The USGA regulation size cups have specially designed soft upper rims for collecting perfect putts, and rejecting off-line or off-speed putts. Use them on a putting Green, or turn any carpeted surface at home or in the office into a personal putting Green! Becoming a great putter takes practice, and with the Go Sports portable putting cups you eliminate any hurdles keeping you from elevating your putting game!