Secret weapon for long distance wheels Cast longer and faster Super corrosion resistant bearing Bearing able to work in salt water High speed bearing make you cast longer and faster Reducing the rolling and saving energy was In ceramics due to its nature it is lighter than steel by about 2/3 the wieght, It is harder than steel when it is in ball form and is practically Bearings without friction because it is non-porousThe will never corrode Or rust when working in salt water. size:3*10*4mm Material:ceramics colour:white Package Contents: 2 * Ceramic bearing Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.