Smallest Transforming Transformers

World's Smallest Transformers, or WSTF for short, was a line created by Takara in 2003. It consisted of Generation 1 characters in the smallest form possible. The figures were blindpacked.

Wave 1

• Bumblebee
• Optimus Prime
• Sideswipe
• Soundwave w/ Ravage
• Starscream

There were two chase figures in the first assortment:

• Bumblebee (red)
• Skywarp

And one shortpacked figure:

• Optimus Prime's trailer

Wave 2

• Megatron
• Optimus Prime ("anime" colors)
• Prowl
• Red Alert
• Thrust

There were two chase figures in the second assortment:

• White Optimus Prime (aka Ultra Magnus)
• Bluestreak

And one shortpacked figure:

• Jazz

Wave 2.5

Wave 2.5 was only available in certain retail stores in limited quantities. It included:

• Jazz
• Megatron
• Optimus Prime ("anime" colors)
• Soundwave w/ Ravage
• Starscream

There were two chase figures in the exclusive assortment:

• Thundercracker
• Optimus Prime's trailer ("anime" version)

And one shortpacked figure:

• Hot Rod

Justitoys, a Hong Kong company, produced bootlegged WSTF-esque versions of the Dinobots after the line concluded. While popular, they are unofficial.

From Teletraan I: The Transformers Wiki, a Wikia wiki.