Are these rubber or polyurethane? Which is better?

This is rubber and rubber is the material we recommend

Hello, does this include 1 or 2 flex discs, need to replace it for a 2009 C63 AMG

This is a single OE flex joint plus hardware and will arrive exactly as pictured

Is this used for both front and rear applications for a W211 E55 AMG (2004)?

This is a perfect match for that application in the front and rear positions

Is this used for both front and rear applications?

We will need to know what vehicle you are servicing in order to assist

I own a 2007 benz e550 and I would like to kno does it have 2 flex disc on it . It's a 4matic

Your vehicle has two flex disks