Used, Excellent Condition, as-is.
Performs like they day it came out of the box, no instabilities at any speed.
Never overclocked, lifetime liquid cooled (liquid cooling keeps temps super low, reducing stress and extending the lifetime of components).
Still a superior and super fast CPU for gamers and creators.

Included:
Original Packaging Box & CPU only, as seen in the listing pictures. No cooling solution included.

Intel Core i9-9900K Desktop Processor:
Specifications
Brand: Intel
Model: Core i9-9900K
Socket: LGA 1151
Base Clock: 3.60 GHz
Boost Clock: Up to 5.0 GHz
Cores: 8 Cores
Threads: 16 Threads
Cache: 16MB Intel Smart Cache
TDP: 95W
Condition

Features:
Unlocked multiplier for overclocking (K-series)
Excellent for gaming and content creation
Compatible with Z390 and Z370 motherboards
Supports DDR4 memory
Integrated Intel UHD Graphics 630
What's Included
Intel Core i9-9900K processor

Chipsets:
Intel Z390
Intel Z370