The Metzler Z6 is a sport-touring tire, and has a dual compound (Note: I had some literature indicating Z-6's were a dual-compound tire, however Metzeler's site has changed and doesn't indicate that its dual compound any longer). The center is harder and has no sipes (treads) for improved mileage. The sides are softer and have sipes for improved cornering and wet traction.
Many people complain that they cannot tell when their rear Metzler Z6 tire is worn out due to the lack of tread sipes in the center of the tire.
If you are new to motorcycling: New tires are very slick until they are scrubbed-in. Ride cautiously for the first 100-200 miles (or use a wire brush to manually scrub the tires). I like to go for a "scrub-in" ride after getting new tires by taking the bike into the twisties. Be cautious, and slowly increase lean angles over the course of a 100-mile ride on your favorite twisty road.