Description: 100% brand new and high quality Suitable for the fish tank, pebble road, garden walkway, wall, vase, flower pot, swimming pool etc. Material: Photoluminescent pigment + resin Pebbles Stone: Size: 2cm-3cm(approx) Colour/Style: Blue Quantity:100 pcs per bag Notes Please absorb the visible light for 15-30 mintues before first-time use of this product (Please don’t absorb the visible light more than 30 mintues), then stones can glow in completely dark place for more than 10 hours. Please note that if stones absorb the visible light more than 10 hours (will be bright in the first 5mins, and will still emit light but dim out for the remaining time), they will only glow 5-6 mintues in the dark place. After the first-time use, the stones will absorb the visible light everyday in the daytime and glow in completely dark place. Package included: 200 Pcs Man-made Pebbles