I play inside our recreation center on oak wood floors in Boulder City, Nevada. Last week we switched over from white inside Jugs to Selkirk inside/outside yellow balls. Approximately 30 of us show up 6 days a week to play on three courts and I purchased 12 balls to start. The balls are more fun to play with better bounce, more predictable, better accuracy, more lively and easier to see. The old balls were worn out in 30 days or sooner, lost their bounce and were so soft you could collapse them easily. I will write another review after 30 days with the new balls, hopefully they will hold up, but so far we love them and Selkirk has hit a home run with their inside/outside balls.