GrillEffects (acrylic speaker inserts) for Transformers.
I've had these ready to go for a while now.. Looks like stern had the same idea as myself with the autobot/decepticon logos, lol.

NOTE the Optimus/Megatron option includes the autobot/decepticon logos in the smaller circle/tweeter section.

These add that next level of immersion for those with speaker lights. These work great combined with a Stern Expression Speaker Light kit or any of PinWoofer Spike3 speaker light kits and diffuser of your liking. (Photos are taken with either a Stern ESLK or Pinwoofer Dynamic kit)

Find out more about Spike3 diffusers or order additional ones to your order here:
https://pinside.com/pinball/shops/shop/1293-pineffects/18760-spike3-diffusers-for-speaker-light-kits

Any questions please ask before ordering