Comments: I've been playing with the Black Code 4s for about a year. It's much better than the Original Black Code just because it had way more spin which the big reason why I've been a big fan of Black Code 4s.
From:Justin, 9/20/18

Comments: Put Black Code 4S in my Vcore Tour G 310 at 48 lbs and hit with it for over a month. While I don't break polys frequently, multifilaments never last me the full week. Black Code 4S barely notched and still has excellent snap back. Good spin, not as aggressive as a Cyclone set up, but pretty similar to a Y-Tex Quadro Twist. The feel was somewhat muted and different from other polys I've tried in the past. My friend said he enjoyed the playability but not the feel. I personally enjoyed both aspects. It doesn't feel like it'd be a good option for a Pro Staff or Prince Tour racquet, given the muted feel, but would play great in a Pure Aero or Graphene Touch Speed MP for more spin and control. Overall, I would give it another go if I ever return to the tweener racquets.
From:SN, 2/5/18

Comments: I play with the Wilson Pro Staff 97 and I have to say that the Black Code 4S is way better than the Original Black Code. I had the Black Code 4S strung up in a Hybrid with Technifibre Multi Feel at 52/55 lbs and I could really feel the ball sink into the 4 Sharp Edges and shoot it off with loads of spin! Overall an awesome string and I would compare it to the ALU Power just because it has that crisper, livelier feel.
From:Justin, 3/27/17

Comments: This string is much better than the Original Black Code.
From:Anonymous, 2/3/17

Comments: Gives a ton of spin while being relatively soft for a poly. Amazing for a couple hours, but tension loss is fast.
From:Devin, 1/17

Comments: Most uderrated string out there. Great bite and power. It is a spin monster. I enjoy playing tennis with this string. Tension maintenance is above average. Only knock is durability. It snaps earlier than other sided poly strings but I'm OK with that considering how well it plays. Strung a Head Speed Graphene MP at 53 lbs.
From:Mario, 11/16

Comments: This string is great, but I see why it is less expensive than comparable strings. I run a hybrid and it is literally an inch too short to string a second racquet. The package says 40 feet, but not quite. This is very misleading, and it should be known to all considering this string.
From:Eric, 5/16

Comments: You can feel the sharp edges of the square section and know this is going to delivery a lot of grip on the ball. Surprisingly, it is soft to hit with, the string provides a lot more spin compared to the regular Black Code. I strung it at 56 lbs in a Radical MP, going to try a lower tension.
From:LP, 9/15

Comments: Strung this string on a Babolat Pure Drive Roddick GT (2009) at 54 lbs, 17g version. First the good news -- spin potential is very good. As good as the original BlackCode in fact, if not slightly better. Power is decent too and just like almost every other poly, there's very little string movement after each shot. Unfortunately, everything else falls into the bad news. The 4S is one of the worst strings at holding tension. I played with it for just 2 sessions, 2 hours each for a a week and after that the string became a handheld trampoline. There was zero control on the already very powerful Pure Drive which makes shots even worse than they should, there was very little feel, and certainly there was nothing that wanted me to give this string a try ever again especially for the price. I cannot recommend this string just on its spin potential alone as there are many other strings out on the market that provides just as much if not more spin, but doesn't become a trampoline after 4 hours of usage.
From:Ben, 9/15