Rubber blocks I have seen to damp fin vibration, but those clips look like they touch each other, which would make the rasttle worse.
My guess is it's a way of keeping food warm on the way back from the Takeaway. Clip the spring rolls on, and you are good to go.
Alternatively...he's created the worlds first 750 Toaster. Clip a piece of bread to each fin, ride round the block first thing in the morning, and when you park up, the toast is done. Residual heat should keep it warm while you get the Marmite out of the top box....