TokTz-xil-ul (or Obsidian throwing rings) are a Ranged weapon used by the TzHaar, most notably the TzHaar-Xil. They cost around 375 Tokkul per throwing ring, and require level 60 Ranged to use.
These have the same stats as dragon throwing axes and dragon javelins, although they lack an off-hand variant. Toktz-xil-ul are often cheaper than dragon throwing weapons, are arguably easier to acquire, and do not have a quest requirement to use. The Ava's attractor and its upgrades will collect Toktz-xil-ul.
The Toktz-xil-ul is based on the Chakram, an Indian sharp-edged, metallic, throwing weapon in a circular, CD-like shape, much like that of the Toktz-xil-ul, but more silver in colouration, along with it being thicker overall and sometimes larger, based on the specific type. These were used by Sikh, Rajput, and Maratha warriors of India.
Before the updates to the Grand Exchange and the trade limit, players would buy these for as much as 3k each.
Though the direct translation would be Obsidian-Sharp/Hunter-Ring, the correct translation would most likely be Sharp-Obsidian-Hunting-Ring, as this weapon is used by the Tzhaar-Xil, the hunters of the Tzhaar Race.
While using abilities with this, the animations are those of a crossbow, even though this is a thrown weapon.