And durable. Make with high bearing steel, deep groove. Common bearing, economical and standard. Less friction, higher speeds and durability. Special double rubber seals without u to seal out dirt while providing frictionless performance. Easy to install and replace. Suitable for: TT01 TT-01 TT01E TT01D TT02B 1/10 RC CarColor: Silver + BlueMaterial: Metal + RubberPackage Contents:12 x RC Car Ball Bearing (5x11x4mm)4 x RC Car Ball Bearing (5x8x2.5mm)4 x RC Car Ball Bearing (8x12x3.5mm)Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm.