With function row and arrow keys, yet only 70-75% width of full-size keyboard.
About SPR75
SPR75 is a 75% layout spring mounted aluminum barebone.
Standard 75% Layout
Specification
ENIG Flex-Cut South-facing PCB (no LED);
FR4 / POM Plate;
5-pin Hot-swappable;
Springs: 120g, 170g, 230g (7pcs each);
Wired Connection through USB-C.
Spring Mount Structure
The plate of SPR75 is exclusively supported by springs, that you can select to adjust the flexibility. Akko provides 3 sets of springs with different forces(120g, 170g, 230g) so that you can make it stiff or flex by your own.
For build instructions, you may refer to this link.