The micropore system of glassy C atoms has been characterized by a number of structural parameters obtained from X-ray small-angle scattering. The pore sizes and pore shapes are very similar to those already observed in other non-graphitizing C atoms, notably carbon fibres. The results suggest that the pore shape is needle-like with sharp edges and that the pore structure stems from a felt-like entanglement of stacks of ribbon-shaped carbon layers.