The Thrasher is a distance driver from Discraft that is meant for fast, easy release for slower to average arm speeds. It is a very forgiving disc for new players. Experienced players can rip it for hyzer flips or anhyzer turns without the ugly rollover. 
 
Z-Line is Discrafts most durable plastic blend. This is a hard translucent plastic that is available in vibrant colors. Discraft claims that this plastic is the choice of pros under normal conditions for slow seasoning.