Well I did a shallow dive into the company and string. Only the packaging is recycled paper, and the string itself does not use any recycled materials, unlike the 2nd String from Isospeed. The way sales are structured, each packet is 12m/40ft string, and bulk buying means 5x or 16x spools of 12m/40ft, with no big reels offered. That means 16x40=640ft @ $210, which $/ft puts the ZERO into premium string category. The "sustainable" marketing is nonsense, since a spool of 12m/40ft would leave me with excess of 1.5m/5ft each time I restring. Multiple that by 16x and you can restring at least 2 restrings with the excess leftover in a reel of 640ft. So even IF the tension and playability is marketed as extra durable, the wasted excess is already nullified whatever "sustainability" claim.
So how does it play? I tried the Zero 1.23 mm full bed as a test. Dropped tension by 3 lbs because it seemed stiff. I was right to do so. The bite is less than the similarly colored Polytour Spin 1.20, which I also tested with Poly Tour Fire, and I dropped tension by 4lbs for that string. It's a heavier string, about 0.5g heavier than my usual 1.15/1.18/1.2mm mains, with 1.2mm cross strings. It's an average power string and above average bite.
Durability: Tension via app showed tension dropped 6.7lbs from 47.5 to 40.8 lbs after the 1st 2.5 hrs. Then it has a flatter tension drop of 1ish lbs every hour of hitting. All the polys I play with, V-Square, V Torque Tour, and Cyclone crossed with PTF, will drop tension of 7-8 lbs (as measured by the app Tennis Vibes), then the drop hits near the elasticity base and drops under 1lbs an hour. The 1.23mm doesn't notch as quickly as Vsquare or V-torque, but about the same as the 1.15mm 18L Cyclone, but the hexagon shape feels "harder", so slightly lower wear isn't surprising. Still at 6 hours, it's a little bit better wearing than 1.20mm Poly Tour Spin.
Playability: It's a muted, stiff and denser feeling string, plays like the Poly Tour Spin in terms of feel. The stiffness and deadness makes the ball rebound quickly, so for me it was good for swinging fast, but slices, volleys felt dead. Spin was good, but that's more me swing up on the string, because of the stiffness. But bite is less than 1.2mm Poly Tour Spin, which combined with Poly Tour Fire as a cross, was very good, and that had more spin. Power isn't the the priority, even with the stiffness. It plays more like a precision control poly. It plays well as a control poly, but to me, not worth the price as a main string, because I restring every other week due to breakage, and buying 16x40ft reels instead of a 660ft reel @ $210, which would allows 19 restrings for my sticks, makes no sense to me, given other strings perform as well if not better, and comes out cheaper, and higher utilisation before disposal. So yeah, a no go unless they start making 660ft+ reels at a decent price.
. One day I will convert someone that I play against to the brand.
