The TSS/S3 Steel model combines our S3 Steel with the added knockdown power of our world renowned Tungsten Super Shot (TSS). The "duplex," also known as a blend, includes 1/4oz of our TSS, to maximize pattern density and help virtually eliminate cripples. When you look back on those hunts, you'll know that little extra made all the difference. Available in BB/7.5, 2/7.5 & 4/7.5. Recommended Shot Size for geese/cranes: BB/7.5, 2/7.5 Recommended Shot Size for Seaducks/Puddle Ducks/Diver Ducks: 2/7.5, 4/7.5 OFFERED IN THE FOLLOWING MODELS: 12 gauge 3a ^2 1-5/16oz 1400 FPS (25 Cartridges per box/250 Rounds per case)