Comes with two "Streamer" System Foams on Foam Changer. Press hook bend onto slit guide to set flies. Avoid stabbing hook point to prevent damaging the foam for longer use.By using with other System Foams sold separately, various customizations are available for your perfect set up. Model DimentionWxHxD) Weight SKU Large Streamer Fly Case 197x42x114(mm) - 7.76x1.65x4.49in 215.5g CF-3500+ Medium Streamer Fly Case 155x40x105(mm) - 6.1x1.57x4.13in 136g CF-2500+ Small Streamer Fly Case 130x36.5x104(mm) - 5.12x1.44x4.09in 110g CF-1500+