In Starfire, the "Base" is a ship-like unit that has station-keeping drives that enable it to hold position within a star system. These drives take very little space, so a base typically has more internal hull spaces available for weapons and defenses than an equivalent-sized ship. Since bases can hold position they are most often used to defend warp points and other fixed position locations within a star system.
This miniature is a representation of a size "2" base (abbreviated BS2). The BS2 is somewhere between a Light Cruiser (CL) and Cruiser (CA) in size. The BS2 is large enough to be an empire's first LRW (missile, torpedo, or kinetic weapon) platform for warp point and planetary defenses.
Starfire miniatures are "squadron scale" (0.5"-5") miniatures designed for the Starfire Quick Start Rules for miniatures. You can downloads the rules from Wargame Vault at
http://www.wargamevault.com/product/214246/Quick-Start-Rules-for-Miniatures
Starfire products can be found at
http://www.wargamevault.com/browse/pub/9056/Starfire-Design-Studio and
http://www.starfiredesign.com/starfire