The Impact Colorado Spinnerbait is great for slow rolling and when fishing night time, muddy water, overcast, or shallow water conditions. The deep cup of the Colorado blade emits a thump that attracts fish. The cup of the blade also catches water, making it easy to keep the spinnerbait in the strike zone at slow speeds. Product Features Weight: 3/8oz Thump and vibration in the water Great for slow rolling, shallow water, and muddy water Spun wire arm Premium hook