SIXray is a dataset of X-ray images of prohibited items found during security checks. The dataset consists of 1,059,231 X-ray images of six common prohibited items, namely guns, knives, wrenches, pliers, scissors, and hammers. 8,929 prohibited items are manually annotated. The dataset has three subsets, namely SIXray10, SIXray100, and SIXray1000.

This dataset poses a completely new challenge of overlapping image data while sharing the same properties as existing datasets, including complex but meaningless context and class imbalance.