We are excited to be parterning w/such a cool company committed to making great products. After demoing the alternatives, we can say that the Jewel adjustable seatposts work really well.    
Check out http://www.blacx.eu

Gear Reviewers - Tester samples will be shipping to the media for reviews shortly. Reputable gear reviewers may sign up by dropping us an email at info@mangai.rollin.com and letting us know which diameter post you will need.

Dealers - Interested dealers are welcome to begin placing pre-orders or simply sign up on our interest list. 

Riders - Let your local dealer know that you’d like a Blacx.