100% brand new quality How do you make them glow? 1.Don't leave the pebbles under light with the package . 2.Don't pile up pebbles , make sure each pebble is fully illuminated . 3.When the pebbles are glowing , please make sure the surroundings are dark enough . 4.You can enjoy the glowing pebbles,the longer the absorption time , the longer the illumination time . Material : resin + Photoluminescent pigment Size: about 0.8"-1.2"/ Pcs 2-3cm Weight: 230g Tips: 1, Please expose the pebbles to the sun or light, make sure absorb enough light, The longer the absorption time, the Brighter of the pebbles, the longer the luminous time. 2, The pebbles send soft glowing and will be hard to notice in the bright environments. Please make it in the dark area. 3, if they dont glow or not bright, its possible the stored light may be exhausted 4, Recommend More for Large Areas. The More You Line, the More Beautiful They Look. Enjoy these glowing pebbles scattered in your garden, like far away stars on the ground. Package Included: 50X Pebble Rocks or 100x Pebble Rocks It depends on your choice Note: 1. Due to manual measurement, there may be a slight tolerance of 1-3cm. 2. Due to difference between different monitors, the picture may not reflect the actual color of the item.