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https://www.nittaku.com/wp-content/uploads/2023/02/85f8c28e45d8a873dd34313dfd34af25.pdf G1 is 37.5 in Shore A (?), 47.5 in Shore O. Z2 is listed as 40 in Shore A. NR-8673 is also listed as 40 in Shore A, is apparently 50 in Shore O.

Both right-handed. Also they can afford new rubbers more easily than me, so maybe I should buy their rubbers...

As a left-handed penholder who sands the blade and not living in Asia, I have next to zero chance of re-selling anything... I only know two other penholders in my city.

Right now I play 6-8 hours per week. So changing every 3-4 months sounds about right?

If the rubber lasts too long, I don't have an excuse to EJ :D

Try doing both yourself. My personal feeling is that if I only straighten my arm during the forward stroke, then my shoulder would move forward first while the arm lags behind my body, hence achieving a "bigger backswing" (arm relative to body).

I am aware that TT11 sells Z2 cheaper, but since they aren't supposed to sell Rozena oversea I didn't use their prices for comparison. Still the point stands: they aren't in the same price range, so it is not fair to say Rozena is bad because it can't perform as well as Z2.

Surely there's a 10 dollar Chinese rubber that can offer developing beginners what Mark V offers (maybe except thin sponge).

Not really a fair comparison. In UK Z2 is about 50 GBP, Rozena is 35 GBP. G1 would be a fair opponent to Rozena, since it is in the same price range.

https://tabletennisspin.com/rubbers/omega-vii-tour-i50.html This site seems to sell this rubber. https://tabletennis-reference.com/rubber/detail/813 Multiple reviews here, this rubber seems to be available in Japan at the very least.

H3 Neo is not a forgiving rubber, at least on passive strokes.

I can't even find out information about stiffness v.s. rebound for spring (most of the search result cares about dampening). Any physicist out there that can help?

My very over-simplistic model for rubber speed (assuming same sponge material): Setting up laboratory testing for blades and rubbers is one of the top items on my list of "If I win the lottery". Right now, even TTGearLab hasn't come up with a way to test rubbers yet...

The fact that Yinhe has >4 variants of BD doesn't help either... same story with their Apollo rubbers. Very confusing

My summary of the patent. Things in quotes are what I am not sure about. ---------- The raw ingredients by weight portion of a environmentally-friendly non-toxic booster for sponges of table tennis rubbers In the form of paste: Antioxidants 0.02-0.1 Sodium bicarbonate 0.2-0.5 Wax 3-5 Oil...

Vitamin E is the key component!

I think #75 is the Chinese version of EX-C froster. Both have the same composition as Viscaria (Koto-ALC-Ayous-Kiri). Given the wide difference in prices (even after factoring in that Chinese products are sold at higher price oversea), I suspect that the Froster has better QC than #75, sort of...

If you can use MXP for a year, I don't think there would be drop-off issue with Z1. Although I've heard that Donic topsheets are not very durable.

Interesting head shape. How does it compare to a "standard" head shape? Supposedly bigger sweet spot?

I don't think Chinese rubbers will get much faster than J3 without boosting (J3 comes with factory tuning). So if you want something even faster you may have to look into what hybrid rubbers can offer.