We provide 9 synthetic structural models. Their purpose is to test and benchmark geomodeling algorithms on geomodels models of increasing complexity. You may copy, reuse, modify and redistribute these models for any purpose without limitations, provided that you cite this paper: Pellerin J, Caumon G, Julio C, Mejia-Herrera P & Botella A. (2015). Elements for measuring the complexity of 3D structural models: Connectivity and geometry. Computers & Geosciences 76:130‑140. DOI:10.1016/j.cageo.2015.01.002 and respect the terms of the Creative Commons Attribution 2.0 Generic License.