The quality of these bearings is satisfactory. They are not 4mm wide. You are thinner. This may be fine for some applications, but they didn't work for me and I wasted a couple of hours.
Electric Guitar Strings Ernie Ball 2221 Regular Slinky - (10-46)
5 Review
π Wheels Manufacturing Ball Retainer Bag: Convenient Storage and Protection for Your Ball Retainers
6 Review
Bearing 608- ZZ1MC3E (8x22x7) NSK//80018
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π§ High-Quality TIMKEN 6203 2RSC3 6203 2RS Bearing - Size: 17X40X12mm
4 Review