The Rainy's Rattlin' Frog is a deadly pattern for both Largemouth and Smallmouth Bass. The internal rattle and deep popping face will get the attention of any fish in the area and induce aggressive strikes. The olive color is great for clear water and sunny days when a very realistic pattern is necessary. The black color is great for those cloudy or turbid water days. Both sizes 4 and 6 flies are 3" long. The difference is the size of the hook and the head of the popper, with the size 4 being larger.