Each video is available in quicktime, real, windows media, and mpeg formats. The Native Drums original videos are 5 minutes long and as such the files are reasonably large. The low resolution files are all approximately 13 megabytes in size, whereas the high resolution files vary from about 30 megabytes (quicktime) to 47 megabytes (windows media). Download times may be lengthy, but you will agree that they are enjoyable, informative, and well worth the wait!