I recently have bought 2 Roto Grip 3 ball rollers, black/yellow and blue,red,white. The way they are made makes them very easy to roll and maneuver. The wider wheels are rubber and roll very smooth. The design makes the bag very easy to lift and it doesn't seem that heavy. The zippers are  strong and the bag material is very durable, and they look good as well. So if you are looking for a quality 3 ball roller, look no further. They also come with a 5 year warranty. I highly recommend them.