Over time, the sophistication of model kits has grown, with greateremphasis on custom parts and printing to make the models morerealistic. The custom parts include small figures that have moveablearms and legs that are designed to complement the models andenhance play value.There has also been a move towards technology. It is now possible topurchase various electronic components that add functions rangingfrom flashing lights through to remote-controlled motors that can beoperated with a smartphone.