MSI Piedra LPEBMMIX3POL40 .75"-1.25" 40 lbs Polished Landscaping Pebbles Mixed Natural Colors feature some grays, tans, and creams in random sizes and shapes. These natural beach pebbles are perfect for landscaping projects to keep weeds down, for water features and fountains, and wandering natural pathways. Made of marble, they offer an elegant natural look for your landscaping and hardscaping projects.