This set contains 42 images as shown on preview pages, wich includes 21 color images and 21 black line versions. Images saved at 300 dpi in png files.Check out these related clipart sets:Urinary System - AnatomyHuman Body Organs - AnatomyHuman Body Systems FriendsForms of Energy Clip ArtLight - ScienceSound - ScienceI also have quite a complete selection of clipart in the following bundle:Human Body Systems - Bundle 1Five Senses BUNDLEForms of Energy Mega Bundle.Sound - Technology Colorful Bundl