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These are the exposed bulkheads surrounded by the stage separating lattice work on the ill fated but still way cool Soviet N1 moon rocket. They are designed to fit snuggly in the lattice assemblies sold separately. So snuggly, in fact, that if purchased, the lower mounting ring of the lattice works has to be cut to allow the slight spreading of the lattice assembly to fit the bulkheads into them. Once fitted, a coupler on the bulkhead allows for attachment to however you plan to model this behemoth. Sorry for the price...I made them as thin as possible and am taking a minimal mark up. But those Soviets liked them big and exposed.