Bones Super Swiss 6 bearings (SS6) are fundamentally different from our famous Bones Swiss. Super Swiss have 6, 3/16 inch balls instead of 7, 5/32 inch balls. Thus, the SS6 balls are 20% larger and roll fewer times to go the same distance. Like bigger wheels on a car, they create less rolling friction and have a higher top speed. SS6's special design and Swiss quality materials enable it to accelerate quicker, roll faster, and resist the impact of skate trick landings better than standard designs. Six Ball Design is Stronger Faster Roll, Quicker Acceleration Pre-Lubricated with Speed Cream Easy Cleaning & Relubricating Removable High Speed Nylon Ball Cage Non-contact Removable Rubber Shield Bones Skate Rated Design & Quality Set of 8 Bearings