These kits are very cool. Unfortunately, my kit was missing M2 x 10mm screws, which I needed by the third step. The pack that should have had the screws was in the box, but was empty. I found them elsewhere, so I did not contact Mostarle. The finished robot model is impressive to look at, the fastener choices are occasionally not well thought out, I feel. The kit would benefit from fewer nuts (Used to fasten stacks of components.) and more threaded components, in my opinion.