This particular section of TV cels features an almost complete sequence of Ironhide and Sunstreaker transforming from their vehicle modes to robots. This is a 16 cel sequence in total but it is unfortunately missing the first two cels out of that sequence. I would to have loved to had this as a complete sequence but considering the rarity of these cels in the first place I shouldn't complain too much. Getting one cel is hard enough but being able to get a sequence of cels from Transformers is almost unheard of.
These cels originate from season one episode five entitled : Roll For It