why do you give me different TNT types?

Description: Shop menu: TNT, gunpowder, fireworks, and Creeper heads Firework affects: Burst (bigger explosion): 1 emerald Shape (explosion shape): 2 emeralds Trail (firework trail): 1 emerald fireworks are sold in bundles of 10 with each bundle being 1 emerald each, firework affects increase the cost of each bundle Special shop menu: Fire TNT: 10 emeralds Water TNT: 10 emeralds Nitro TNT: 10 emeralds Black hole TNT: 100 emeralds