Properties of stripped stars shown as a function of initial mass, for different metallicities. The parameters plotted here are derived from our evolutionary calculations with MESA, before inclusion of an atmosphere. Panel b: total amount of pure hydrogen left after stripping, which remains in a layer consisting of helium and hydrogen at the surface. Panel d: total luminosity L_tot as well as the luminosity resulting from the hydrogen-burning shell alone L_H in lighter colors. The labels in panel l indicate thewind mass-loss rates that are used, where NL00, V01 and K16 stand for Nugis & Lamers (2000), Vink et al. (2001) and Krtička et al. (2016), respectively.