i took the balls off and put them on cheap stainless steal bars and it worked a lot better i ordered this product because i am a [SEP] not what i expected at all the bars were awkwardly to long and very uncomfortable i took the balls off and put them on cheap stainless steal bars and it worked a lot better i ordered this product because i am allergic to surgical grade stainless steal so i was very sad when they were not what i expected