Updated version of discontinued set RC4817.
This product presents full-open nozzles, as we can see on real aircraft shut down engines. The nozzles have correct scale size and fit 1/48 HobbyBoss Su-27 family and Kitty Hawk Su-27, Su-27UB, Su-34.
Also this set allows you to make proper angle installation. Real plane has visible 2 degrees downward incidence, so you can sand rear part of the fuselage for proper fit.