A double-edged sword might be tricky, but a double-sided business card design presents no inconveniences. Black and orange are clean and clear, presenting a strictly professional attitude that every business needs. But if black and orange are not your colors, you can easily make the proper adjustments to share the identity of your businesses and include a different color scheme.
The template offered for free by Wisxi shares a modern design for both sides, which means that you can use one side for a general branding presentation and leave the second side of the card blank or you can add the contact info of employees and managers. Print-ready for instant use, the 3.5 x 2 inches card designs (CMYK) are easily editable with organized Illustrator which that allows you to customize the template without hassle.