The light could glow in the dark for more than 10-12 hours after absorbing the sunlight for 10 ~ 20 min. Line a walkway, the stones will glow in the dark, and it seems that you are walking on the star. You can edge a flower bed or fill a planter with pebble stones, or put it on waterscapes, landscape decoration, potted plants, gardens, crafts, aquariums, etc. You can use it to make different shapes and words to add the special day more interesting. Add additional fresh ingredients at your home, bring special color into your life, the little cute stuff could be an enchanting setting of romantic on a very special day. Specifications: Material: Resin Color: light blue, dark green Size: diameter: about 2.2cm Tips: Please keep the pebbles away from children to avoid a danger of suffocation. It may not glow enough if fails to absorb the sufficient sunlight. These pebbles glow softly and it is hard to be noticed if not in the dark environment. Note: 1. Due to the light and screen difference, the item’s color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.