Arrowhead 120, 140, and the discussed 160 variant use numbers corresponding to their approximate intended lengths. Even the 140 family allows variation, with hull lengths described as roughly 137 or 140 metres depending on the customer. Poland and Indonesia can use the available space for their own sensors, weapons, accommodation, and future changes. The design is compared with a practical van because the customer receives a sound platform with a large usable interior. Relatively small crews reduce the recurring personnel burden. Efficient construction and open volume make the family attractive to navies that want to shape a ship around their own requirements.
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Arrowhead's export appeal is space for adaptation
Polish and Indonesian interest reflects Arrowhead's large hull, moderate crew needs, and room for national weapons and later upgrades.