With your Go Pass, you can take 10 single 2nd class trips between two Belgian stations of your choice (frontier points excluded), for 50,00 EUR*

A Go Pass is valid for 1 year from the date of purchase and isn't registered in an individual name, so you can lend it to friends or travel with them, on condition that they're under 26 as well. 

* Price valid from 1st February 2009.