I bought these for use in ramps and bowls. My current stoppers are soft rubber and have really grippy surfaces, which I really like. They seemed to have some kind of slip, which didn't help me at all. I didn't actually screw them in or try them out because I didn't want to return the used finger rests. I dragged them along the wall with my hand and they slipped off. If you use them for flat surfaces, running, or staying on track when you lose balance, they're probably fine. They have a nice big flat surface. They're also a perfect circle, so you don't have to specifically rotate them to bring the right area forward like big Bionics or Gumball Superballs. There's nothing wrong with them, they just don't suit me.
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