The Materials Project provides open access to computed information on known and predicted materials. This database is developed and maintained by researchers at Lawrence Berkeley National Lab in collaboration with multiple research universities including UC Berkeley, MIT, UCSD, Duke, Caltech, UW-Madison, and UCL Belgium. This dataset contains mechanical properties in the elastic limit. The full elastic tensor as well as Poisson ratio and bulk (K) and shear (G) moduli are given for over 4000 materials. All numbers for the tensor and derived moduli are in units of GPa. The calculation energy cutoff is in units of eV.