The Spinner class were small starships of characteristic shape, utilized by the Tholian Assembly during the 23rd century. These vessels were armed with plasma torpedo-like weaponry. But their most powerful weapon was the so-called "Tholian web". This web was "weaved" by two or more Tholian vessels around an enemy ship, trapping it. The web could then be contracted, destroying the vessel inside.
Spinner class vessels featured the characteristic conical shape common to most Tholian starships, whose their small size made these vessels highly agile. This class was outfitted with formidable weaponry, including a type of energy-dampening weapon which they used against Enterprise to render it almost completely powerless. The interiors of these vessels were kept at temperatures exceeding 200 °C
In 2268, a Tholian vessel intercepted the USS Enterprise, demanding that it leave Tholian territory. At the request of first officer Spock, Tholian Commander Loskene allowed the Enterprise additional time before they were required to withdraw to allow the Enterprise to rescue James T. Kirk from the interphased USS Defiant. The Enterprise crew was unable to rescue Kirk within the Tholian time limit and the Tholians opened fire, damaging the Enterprise. The Enterprise returned fire, inflicting damage on the Tholian vessel.
Soon after, a second Tholian vessel appeared, and the two ships began constructing a web in an attempt to trap the Enterprise. The Enterprise crew, fortunately, was able to recover Kirk and escape before they fell victim to the Tholian's web.