They’re obtained as a fall in wyverns from the Wyvern Cave.
The boots also help protect the wearer by the exceptionally hot ground of their Karuulm Slayer Dungeon.
Granite bracelets are boots made from granite stone. They need degree 50 Defence and Power to equip, providing strength bonus and defensive stats exceptional to rune boots. Unlike many melee boots, they also supply a Ranged defence bonus.