Google is your friend...

XYZ - made in Taiwan
http://www.xyz-racing.com/about.php


K Sport. Proved in Time Attack. Made in China?
http://www.ksport.co.uk/index.asp

Review:
http://uk-mkivs.net/forums/p/357078/2435536.aspx

Total shit unless you're using it to slow down a plastic wheel in a hamster's cage judging by the reviews.

Charlie