What are they made from?

Retaining walls are made from various materials depending on your needs and design preferences. Segmented pavers and bricks are standard low-profile retaining walls, often used to backfill gravel or soil. They can also be constructed with poured concrete or concrete blocks, both of which provide versatility and durability. Boulders and natural stones, including limestone and flagstone are often used for their durability and natural beauty.