Roto Grip bowling products in my opinion are the best in the world. Their bowling balls are top of the line,their equipment are the very best that I have use. I have used other brands of bowling equipment but roto grip is the best. On tv you will most times see that most pro bowlers bowl with roto grip products. Just out their website www.rotogrip.com Their bowling balls are hard hitting and most used by all most bowlers in the world.