2 Headset Bearings 5/32" ball size x 16 balls. Fits 1" headset. Set of bearing. Pair of bearings. for bicycle head set, bike headset, lowrider bikes, beach cruiser, limos, stretch bicycles. - Walmart.com
Buyers guide to mountain bike headsets - Merlin Cycles Blog
Bicycle Headset Bearings: A Practical Guide - Hambini Engineering
Everything you need to know about bike headsets | road.cc