I recently installed the ZSpeed HD Slave and Southbend DXD Clutch/Flywheel combo...
I can tell you and can confirm that there is not one plastic piece in the Zspeed HD Slave...Even my friend that helped me do the install who works for Nissan as a Tech was amazed at the craftsmanship of the product...especially in comparison the stock slave which is a peice of crap...
Here are some pics I took of the slave and clutch kit when it was installed...