CONCRETE TEST CYLINDER 4" x 8". This 4x8 concrete test cylinder is made of high quality polypropylene copolymer. It is designed for easy removal, saving you time and money. The logo can be printed on the cylinder itself, if you like. Product offered in a wide variety of colors. A small fee is charged for its installation. Furthermore, it is a recyclable, biodegradable product and is not affected by heat or light. Other product sizes are also available.