For complete workflow compatibility, we recommend downloading the original file.The viewer version is intended only for use in the web viewer. In the source file, the following are fully preserved:✔ full scene structure✔ unsimplified materials✔ correct PBR texture maps✔ proper object namingIf you plan to use this model in production, choose the Original format.This is 20 basic sloped pieces. These Lego pieces are very detailed and will make any structure built with them look fantastic! You can change the colors to fit whatever you are building. This set will grow as I have time to create more pieces. Let me know what pieces you would like to see sooner than later and I will work on those pieces first.