I don't know why they say this. My rubber not tacky and not slow at all. I have Gevo Nexxus EL 48 on other side of blade and almost don't feel difference between rubbers. Gewo feels a bit harder but speed about same
Interesting PROTT selling HL5. ST handle has same picture as on top but FL has different picture
https://www.prott.vip/Product-Details.aspx?productcode=LONG5