These fit most pushchairs with 12" wheels. They are marked 12 1/2 X 1.75 X 2 1/4. They come with a bent valve to make inflating easier.
The standard tubes will fit the Phil and Teds range which use 12 inch wheels, Mutsy range and the Quinny Buzz, Mood and Speedi. They will also fit the iCandy Apple and Peach Jogger.