La Bella 760FL the closest to 40-100 Chromes, I think. The gauges are almost identical. Thomastiks too supple in my experience. The .70 A string is just too soft (to get the octave accurate, you need to push the saddle waaaay forward). Shame, because they sound great. I replaced the A on my set with a Chrome in .80. It's almost as good sounding as the E, D and G, but not quite (although better than the soggy Thomsatik A, which sounded a bit limp to my ears).