Serpent product 600617 - Bearingset 811 V2 Small 12 Cobra GT 3.0 (SER600047) Cobra GT Series Serpent made Bearingset 811 V2 small 12 (600617) Cobra GT 3.0 (SER600047) Cobra GT Series Specifications4pcs Ballbearing 8X16X54pcs Ballbearing 15X21X42pcs Ballbearing 13X19X42pcs Ballbearing 8X19X6