Rollerblade Bearings SG9 - 16pk GoPro Size / Hardness: 100mm /

Size / Hardness: 100mm / 85A

Superfeet GREEN insoles haven’t changed much since their design in 1977

Sold in a set of 4 wheels with 8 bearings

Secondary heat treatment for added strength & durability

Check out the spectre here: You can mix and match colors

Rollerblade Bearings SG9 - 16pk GoPro Size / Hardness: 100mm /Rollerblade's SG9 Bearings come in a 16 pack. These are the bearings Rollerblade uses in many of their traning and or performance level skates. They are fast, durable, and easy to keep clean and quiet. SG ratings are Rollerblade specific and said to be comparable to that of ABEC. SG stands for silicone grease. The silicone grease protects bearings from the elements and allows the wheels to spin fast while keeping them well lubed. High quality