The C004 is a 4 x 8 inches dark gray PP plastic test cylinder with white lid (lid included). This container is typically used to test the integrity of concrete. The lid is included, the container and lid is sold as a single unit. Polypropylene (PP) is marked with the resin identification code of 5. PP is less flexible than LDPE, somewhat stiffer than other plastics, reasonably economical, and can be translucent, opaque, or of any color. PP has very good resistance to fatigue, and has an extremely high melting point (320 degrees Fahrenheit or 160 degrees Celsius).