This is just 8GB module that we are selling part of the kit.
We are only selling 1 module ( 8GB).

HyperX HX421C14FBK2/16 is a kit of two 1G x 64-bit (8GB) DDR4-2133 CL14 SDRAM (Synchronous DRAM) 2Rx8, memory module, based on sixteen 512M x 8-bit FBGA components per module. Each module kit supports Intel® Extreme Memory Profiles (Intel® XMP) 2.0. Total kit capacity is 16GB. Each module has been tested to run at DDR4-2133 at a low latency timing of 14-14-14 at 1.2V. Additional timing parameters are shown in the Plug-N-Play (PnP) Timing Parameters section below. The JEDEC standard electrical and mechanical specifications are as follows:

JEDEC/XMP TIMING PARAMETERS • JEDEC/PnP: DDR4-2133 CL14-14-14 @1.2V • XMP Profile #1: DDR4-2133 CL14-14-14 @1.2V