Oajen 3" caster PVC rollerblade wheel with 7/16" x 7/8" stem, double ball bearing, ball bearing axle, pack of 5, great for gaming chair Oajen 3" caster PVC wheel with 7/16" x 7/8" stem, double ball bearing, pack of 5 130 lbs rating per caster. PVC wheel is softer, good for hardwood floor or concrete. Ball bearing axle with two 608ZZ bearings. Made in Taiwan.