Super fine desiccant dust.Specifications Premium Brush applicator. Dries small flies in seconds. Simple to use. Works great with CDC. Ultra-fine. Dessicant Powder. Great For Keeping Small, Sparse, Skinny Dry Flies Floating On Surface Film. The Best Powder For Use With Nymphs To Create A Realistic Air Bubble Just Like The Real Thing. Dimension - 1 1/4 x 1 x 3 in.