Spinomastyx hide

Spinomastyx hide is a Tier 6 Dungeoneering hide used to make spinoleather armour. Players can obtain the hide either by hunting or killing a Stegomastyx or buying it from the Smuggler. Trapping is the more efficient method to gain hides instead of outright killing as more hides can be obtained while killing it may actually result in no hides.

The hide is also used as the tertiary ingredient in creating Brah hoardstalker pouches.

Players can make the respective spinoleather armour with a needle and thread in the inventory and the requisite Crafting level:

Reference

 * RuneScape Knowledge Base: Dungeoneering - Crafting Tables