Hello, I've bought my husband a Hofner Ignition Violin Bass for Christmas and I have read that La Bella flat wound strings make it sound much better. There seem to be two types/measurements though. One set says 0.39. 0.56 0.77 0.96 and the other says 0.50 0.65 0.80 0.100. Does it matter which ones I get - those numbers mean absolutely nothing to me! I'd ask him, but it's a surprise! Thanks for your help!