These black glass beads have a finish making them look like black pearls and are ideal for use in either your existing dish or one of our range of plant trays allowing you to maintain a more humid atmosphere around your plants. Simply use these to a depth of 1 - 2 inches and top up with water to just below the upper level of beads then place your plants directly on the pebbles.Bead size is 1 - 1.5cm and are in 450g net bags