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The finger strap keeps it snug so I can control the pressure instead of it slipping. The double row of thorns gives this scratchy, tingling drag that builds slowly. Way more intense than I expected for something so small.

Wasn't sure about the double row of spikes at first but the lighter pressure from the smaller thorn ring is perfect for warm-up. The finger loop keeps it steady even when my hand gets a bit slippery, and the roller spins smoothly without snagging.

Slid the finger loop on and the double row of spikes gives this rolling scratch that builds slowly rather than stinging all at once. The wheel spins smoothly with barely any pressure, which surprised me.