Part No. 344203. Sintered iron rod guide to extend life of shock absorber. Preferable for those who want to feel the difference. Unless otherwise provided by law, you will bear any other costs incurred in making a claim under this warranty.
Rubbish quality. I thought all KYB were still Japanese, apparently not. They're noisy (squeeky) and don't ride well at all. Spend more and buy quality shocks if you use your vehicle a lot.