This is the canopy mask for the Eduard 1/72 Bf-110G-4 Night fighter. It’s recommended for the Weekend kit, which is reviewed here: Eduard Bf-110g-4 weekend kit The ProfiPACK kit comes with the mask.
You get the mask and a very good set of instructions.
The mask is die cut on Kabuki tape, nice and thin and it sticks marvelously.
I have one trick. It’s very hard to see the edges of the mask items when they’re on the backing sheet. I slather on a tiny bit of acrylic black, like what’s used for weathering, and it picks out the edges nicely.