Slightly same size as tennis ball not perfect in sperhical shape . i'd say 30ft above my head a light appeared from nothing travelled 40 metres in north to be direction at approx 60kmper hr.All in a few seconds. then after it dissapears as fast as it came anthor light does the same a bit more of a distance away same height length speed. . except it went east to be in direction. just before it happened my scalp felt nice n tingly very pleasant.Best described this electric ball i can describe wen u strike a match u have those lines around the flame whilst being lit. i think if it were to be next to something the light wld be reflective as i've seen non reflective light before. saw the same event again when i got home that night and the next over my neighbours roof.