You get an assortment of random LEGO® Bionicle & Hero Factory parts. On average, there are roughly 75% Bionicle parts and 25% Hero Factory parts. Parts are compatible with other LEGO® pieces and each other. Masks are the most popular so we make sure to include at least 1 Bionicle mask in every half pound. So if you order one pound you will get at least 2 masks and if you order 3 pounds you will get at least 6 masks. All parts are clean, coming straight from our washing/drying process to their packaging. We do our best to go through all of the pieces to make sure there are no defects or non-LEGO® pieces but some may slip through the cracks so we always include a little extra in every order.