The solar cells used in our DIY solar panels kits consist of two slightly different kinds of Everbright solar cells, Devens cells and German cells. Typically marked with .5v3.6a in the title of listings, Devens cells are characterized by its pronounced multi crystalline look with a more visible mosaic look front side. The front side smoother, showing the base wafer's multi crystalline grain boundaries more pronouncedly. It resembles traditional multi crystalline solar cells more. German cells have a slid blue front side, with a more shiny finish, and can show some surface wrinkles from the natural wafer growth method from the base materials. Both are excellent cells, and German cells are sometimes sold in pretabbed format, whereas Devens cells are often sold in untabbed format. Even the tabbed cells are only tabbed on the front side. Devens cells have slightly higher efficiency, and the cells that we sell here have fairly consistent power.