- Assorted color plastic pebbles that glow in the dark! - These are an exciting add-on to your rock mix display or part of a glow-in-the-dark merchandising story! - Super charge the glow effect by placing pebbles in the sun or flash a beam of light over them with a UV/standard flashlight. - This stone is made of resin - not naturally formed. Includes 72 plastic pebbles Pebble Size: 0.75"-1.5"L Rocks | Souvenir | Stones | Museum | Adventure | Park | Gift | Outer Space