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I decided to make a new design for the TOS Impulse Engines that had a little more detail to it, and was a little beefire. The one included with the 1/1000 Polar Lights TOS Enterprise was a little lacking in my opinion. This one will fit into the same spot with very little, if any filling.
This one is a 2 pack, joined by two thin sprues, because we all know that we're here to build up our fleets!