Best non-raid gear for Frost Mage?

Why is this BIS for Frost Mages? What spells are you using in your rotation to proc this? I'm super confused Also, the wowhead guide says

Find the best in slot gear for Mage's in World of Warcraft Classic at WoW Classic BiS

bestcrazygames Molten Core Frost Mage Best in Slot · Cold Snap Icon Cold Snap · Crimson Shocker Icon Crimson Shocker · Bonecreeper Stylus Icon Bonecreeper Stylus

bestie malayalam short film Need to know best in slot gear currently for frost mage pve