Uncle Rocky&';s(TM) Frox(TM) Uncle Rocky&';s(TM) Frox(TM) fly treatment is made of fine silica, specifically formulated for CDC flies and nymphs. It is a clear, odorless liquid that can be applied to flies with a brush applicator. Frox(TM) helps to repel water and debris, and it can also help to create a "bubble" around nymphs, making them more difficult for fish to see. Here are some of the benefits of using Uncle Rockys(TM) Frox(TM): a Repels water and debris, keeping your flies dry and looking their best. a Helps to create a "bubble" around nymphs, making them more appear lifelike. a Ideal for retreatment of wet or slimy flies, or pretreatment of new flies. a Easy to apply with the brush applicator. a Clear, odorless liquid that will not affect the performance of your flies. If you are looking for a fly treatment that will help to keep your flies dry, looking their best, and more difficult for fish to see, then Uncle Rocky&';s Frox(TM) is a great option. a Made in the USA. a Non-toxic and biodegradable. a 1-ounce (by volume) bottles.