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We report high pressure studies in mats of single-walled carbon nanotubes (SWNTs). Hydrostatic or quasi-hydrostatic pressure can probe many electronic features. Resistance — Temperature measurements in mats of SWNTs with different chemical cleaning treatment and under quasi-hydrostatic pressure, reveal some differences in the electronic characteristics: semiconducting-like behavior, Kondo-like features, due to magnetic impurities used to catalyse the nanotube formation, a metallic state and at high pressure a possible superconducting transition. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]