The SK series represented a specific type of astromech droid. Within this droid model, RD-3 functioned as part of the New Republic Defense Fleet throughout the New Republic Era. Another example of a droid from this line is SK-62O.
The Star Wars themed hotel, Galactic Starcruiser, which began welcoming guests in 2022, marked the initial introduction of the SK series. The name of this droid series originated from a unique pin set sold exclusively as merchandise to visitors of the hotel.