Guoguo makes all kinds of power banks, here showing PET mirror with 5000mAh power bank for $10 (bulk), they have 335 injection machines and PC molding machines, enabling them to change designs, donut shapes with 5200mAh at $7 (bulk), their minimum order quantity is 500 pieces, they can make power banks with capacities up to 15600mAh and more. They sell about 200 thousand power banks per month.
You can contact Guoguo here:
Shenzhen Guoguo Creative Technology Co.,Ltd.
Lucia Zhou
luciazhou@guoguosz.com
Mobile: +86 13924668385
Phone: +86 755 84655399
http://guoguosz.com