More info here:

http://www.40percent.club/2018/10/tetris.html

How to order PCBs from gerber files

EasyEDA ordering info:

PCB

Gerber: 4x4_X.zip

76.2mm Max* 76.2mm Max;
Layers: 2;
PCB Thickness: 1.6mm;
PCB Qty.: 10;
PCB Color: Green;
Surface Finish: HASL;
Copper Weight: 1;
Panelized PCBs: 1

Files released under https://creativecommons.org/licenses/by-nc-sa/4.0/