In models of large extra dimensions, the string and Planck scales become accessible at future colliders. When the energy scale is above the string scale or Planck scale a number of interesting phenomena occur, namely, production of stringy states, \(p\)-branes, string balls, black hole, etc. In this Proceedings, we summarize a recent work \cite{me0} on the production of black holes, string balls, and \(p\)-branes at hadronic supercolliders, and discuss their signatures.