Nipphanna-rūpa: 'produced materiality', is identical with rūpa-rūpa 'materiality proper', i.e. material or actual materiality, as contrasted with 'unproduced materiality' anipphanna-rūpa consisting of mere qualities or modes of materiality, e.g. impermanence, etc., which are also enumerated among the 28 phenomena of the materiality group. See khandha, Vis.M XIV, 73.
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.