  Ultra High Energy Cosmic Rays may include strangelets, a form of Strange
Quark Matter, among their components. We briefly review their properties and
discuss how they can be accelerated via Penrose process taking place in
singular rotating Kerr black holes or in their smooth, horizonless counterparts
in string theory, according to the fuzzball proposal. We focus on non-BPS
solutions of the JMaRT kind and compute the efficiency of Penrose process that
turns out not to be bounded unlike for Kerr BHs.
