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This part is intended to be used if you are building the 1/32 Apollo spacecraft from Monogram. It will be completely replace parts 72, 73 and 74 of the original model. You have 4 sets of RCS thrusters sold with this part. For further explanation on how to use this part please refer to my website : http://spacemodels.nuxit.net/1-32%20CM/index.htm