Pyrospinners were hostile robots. They were part of Nefarious' army. Similar to the Thermosplitters, they spun around while using a flamethrower that was attached to their arms. As a small, red and black robot with four yellow eyes and a single blue antenna, they didn't look very challenging to defeat at first. But as they were approached, they began to spin around, emitting flames that damaged the player on contact.
A melee attack wouldn't do much good against these pesky little enemies; a more suitable strategy was to hire Mr. Zurkon, or use your own Constructo Pistol. They were often found around Thrashers and Plasma Containers.