Are your Toslink Digital Optical cables plastic or glass? Is one better than the other?

All our Toslink cables are POF (Plastic Optical Fiber). For most audio systems, you should not hear any difference between a plastic optical cable and a glass quartz optical cable unless you are at lengths exceeding 100 feet and transmitting at extreme bandwidth levels. In fact, the performance with plastic has been improving because the Optoelectrical Components (used in Audio Equipment) are designed to interface with POF fibers.