Clean and waterproof solar spheres which are also suitable for direct floor installation. At the moment, after 1 month, the balls shine (have 2 pcs 25cm and 2x 30cm bought) through the night and well above-average brightness, and my balls Warm yellow light, not bluish as reported by other reviews. I had 5 balls from the hardware store that had after a year because of the yellow and white plastic was not UV resistant, 2 balls were flooded by the ground preparation, let's see how they look after one year. 1 point deduction there for ridiculous, 3cm long ground stakes.