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Return& Item Quality control:
1 year warranty  

Fit with all the Giant & Liv OverDrive 2 Road Headset (1 1/4" Top and 1 1/2" Bottom): TCR, Defy, TCX, Propel LANGMA, AVAIL ....

Won't fit OverDrive  or OverDrive 2 MTB

Detailed information of the product:

Lower headset bearing: 32.8x41.8x6 MR136 

Upper Headset bearing: 37x46.9x7 MR137

2 Types of Bearing Option:

Steel：

Bearing Race Material: P6 bearing steel
Bearing Ball Material: P6 bearing steel
Enclosure: Two Rubber Seals

Ceramics:

Bearing Race Material: P6 bearing steel
Bearing Ball Material: Nitrided Silicon Ceramic SI3N4
Enclosure: Two Rubber Seals