Black Lava Rocks Stone Volcanic Stone for Garden, Aquarium, Plant, Building. Water Retention Capability: Porous structure retains water and nutrients, ideal for shallow-root plants. Versatile Applications: Suitable for gardens, aquariums, plants, building walls, and swimming pools. OEM and ODM Service: Accepts OEM orders and provides ODM services for customized products. ISO 9001 Certified: Manufacturing plants hold ISO 9001 certification with qualified management systems. Fast Delivery: Average lead time within 15 workdays for both peak and off-season periods. Flexible Payment Terms: Supports LC, T/T, D/P, PayPal, Western Union, and small-amount payments. Free Sample Available: Provides free samples for quality verification before bulk orders. Professional Manufacturer: Established in 2020 with over 10 years industry experience and own factory.