We're a fairly niche company to start with at Muller Energy (specialising in high quality LiFePO4 batteries), but this might be our nichiest deal yet!
To answer questions about what it actually is: In order to build a 12V LiFePO4 battery, you need four individual battery cells. These cell holders make for a very neat and secure setup when building a battery. So it's a product targeted towards DIYers that have ~300Ah battery that they have built or that they want to build, making the process a bit simpler and the result a little nicer.
Hopefully this will clear up any confusion! 🙂
OP, is it all held together with (just) the white tape, and is that included if yes?