These glow-in-the-dark rocks come in a bag of 500 pieces, each about 1 in. in diameter and weighing 2.3 lbs. Made of resin with a smooth surface and rounded edges, they offer a polished, safe design for various uses. Durable and weather-resistant, they stand up to sun and rain, ensuring long-term use both indoors and outdoors. To glow, absorb light for 1 hour-whether from sunlight or lamplight-and they’ll illuminate for 3-4 hours, brightest in the first 30 minutes before dimming gradually. Available in 3 color options, they add vibrant, eye-catching glow to spaces like garden landscaping, backyard decor, flower beds, indoor vases, and plant pots. Lightweight, they’re also ideal for fish tanks, enhancing the aquatic environment without excess weight.