Popcorn (bounce) spring inside gets caught on the wheel every now and then, not much.
Excellent product. No flaws in manufacturing. Would recommend it for anyone who wants to speed up thier stock or re-boarded halo as well as lighten the overall weight. This wheel has dramatically increased my halo's speed due to its incredibly lightweight design. The ultra light weight of the drive cone combined with the speed wheel gives you an unbelievable speed increase, the thing rippps.
Buy it, its way better than any other halo drive cone out there.