This is a pack of sixteen Revolution Design Racing Products Ultra 1/10 Shock O-Rings. These shock seals are made from a specially formulated compound that is less prone to "swelling" when exposed to silicone shock oil meaning a better seat of the seals within the damper cartridge over a longer period of time. The O-rings also have a lower break away point compared to standard "orange" seals for more sensitive damper action. The package includes sixteen o-rings, enough to equip 8 shocks, and they fit nearly all of today's 1/10th on-road and off-road shock absorbers.