The Big D® Opal Urinal Screen, which comes 10 per pack, features a specially engineered copolymer impregnated with an incredibly strong organic odor counteracting compound which is VOC compliant in all 50 states. Its one-sided anti-splash texture is made of spikes that are 200% longer than its counterparts to help prevent splash back and cross contamination of urine to other areas outside the restroom. The Opal is flexible for a proper fit to any urinal contour. The translucent design allows total viewing of the drain to ensure it remains free flowing as it collects debris before the drain is clogged. It is also safe for use in waterless urinals. Its fragrance will last for 45 to 60 days.