Spiro E - You will be assimilated. Resistance is Futile
OK, T-I makes five different Spiro E strings for "standard" "orchestra" tuning. In order of tension (when each is mounted on the same bass), they are (the string part number, not the set number):
S39W (the E string in the 4/4 S42W set)
3885.5W (the E string in the 3/4 3885W set)
S39 (the E string in the 4/4 S42 Mitt "classic reds" set)
3885.5 (the E string in the 3/4 3885 mitt set)
S39ST (the famous, or infamous, stark E string)
For those playing mostly pizz, it seems that most of the discussion revolves around what G string to use with a Spiro EAD, but in reality, it seems most players use various makes and models for ADG, and seem to gravitate towards one of these five Spiro E strings, with the most common being the S39 Mitt, although the 3885.5W is the least known, but having the most potential of blending in tone and feel, of any of the five.