This set of 1G-3 Late 1G-3 seats include the SEWARS system and were used in many of the later variants of the venerable Skyhawk. This set features the wrinkled Parachute pack which some modelers prefer to add "life" to the seat. If you prefer the tightly packed set got take a look at sets 48212 (2) and 48213 (1) respectively. As always check your references for the particular jet you are building and during the timeframe you are depicting.