Not for inline skates but to replace wheels on a car slider that have become unusable over the years. They are perfect for this application and the softer wheel makes for a smoother ride. Looking at the construction I'd say it's the underside of skate wheels. The bearings are so-so and the rolling surface isn't perfectly smooth. But as I said, for my purposes, a low price and acceptable quality is enough.
π OTOOLIFE Mesh Fabric Nano Summer Sports Active wear Easy to Breathe Outdoor Riding Running Face Mask for Men Women, Black, 1 Count (Pack of 1), Mesh Sport Mask
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π Ultimate Protection Gear: Senmortar Airsoft Mask Full Face Tactical Mask for Halloween CS Game, Motocross & Cosplay
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