This is a set of resin 1/48 Supermarine Spitfire Mk IX Flared Exhausts from Ultracast.   These exhausts replace the kit exhausts to give a higher level of detail to your model. 

Clean up is very minimal and the seats come attached to the casting blocks with very easy to manage connection points and removal is easily done with no loss of detail.  The detail level and casting quality is flawless.  The exhaust pipes are hollow on the end and even include the casting line that appears on the full sized cast exhausts.

The exhausts are a major focal point on models and these will really improve the look of the exhaust area on your next Supermarine Spitfire Mk IX.  

You can buy this and many other detail items directly from Ultracast.

Steve Bamford