Customized kits are typically built by more experienced modelers who take a kit and add components, either scratchbuilt or commercial conversion or aftermarket accessories. Such models may be more highly detailed than a straight build 'out of the box' though the trend to more detailed kits is decreasing the difference. The term 'kitbashing' denotes models built using parts from more than one kit to make a single, more accurate or different model. Many armor modelers engage in the use of aftermarket sets and built from scratch (scratchbuilt) parts to make their models more accurate or simply unique. In extreme, master-level cases, a model with hundreds of kit components may be detailed with several hundred additional commercial and home-fabricated parts to reach a very high level of realism.