2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/219694A study is presented illustrating the excellent potential of future International Linear Collider (ILC) experiments to detect metastable staus $\stau$, measure precisely their mass and lifetime, and to determine the mass of the gravitino $\sG$ from the decay $\stau\toτ\sG$, thus providing direct access to the gravitational coupling, respectively Planck scale.Talk given at LCWS/ILC 2007 and SUSY 2007. Submitted for the SUSY07 proceedingsHigh Energy Physics - Phenomenologytext