These are the screws used for assembly. http://www.amazon.com/Machine-Plated-Finish-Phillips-Threads/dp/B000NHXOCG?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o08_s00
If you have trouble assembling it, check out this tutorial for assembling the ghost cube which is a similar puzzle to this. https://www.youtube.com/watch?v=ffsfon3UWsU