Cluster of black spheres seen over Candler, NC.I was conducting a safety audit outside the shipping and receiving yard on the property of the company where I work in Candler, NC and I looked up and noticed a cluster of black circles or spheres. They were about 8 to 10 of the spheres all the same size, all black, some were slightly scattered from the cluster pack, some higher and lower and spend out, but all close together. The height I would guess was about 3 to 4 thousand feet above ground and they were travelling across the sky east to west at a speed of about 50 miles per hours – I’m guessing. At first I thought it was a flock of birds, but no flapping of wings, maybe a cluster of black balloons, no, moving too deliberate and at a the same height and speed during the whole time I watched them. Maybe a balloon powered micro lite, never heard of one and no engine sound coming from it. It appeared to gain height to cross over a nearby mountain. ???