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Google lens says it's a shock absorber of some sort (gave below link), but as others mention you need a ruler in the picture for scale to be able to tell exactly.
Buy 12" Mechanical Shock Absorber 10mm / 3/8" ID for Go Kart Cart Minibike Mini Bike: Shock Absorbers - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
How many clicks from full stiff for your keychain dampers? I've been using 2 clicks and I think it's way too stiff, I feel every ridge and valley on my key profiles.