https://www.herbsbc.ca/index.php/services/retaining-walls/retaining-walls-types/62-stackstone/153-stackstone#sigFreeId25511fd2fd
StackStone walls are designed for garden walls, short free-standing walls, edging details and raised flower beds. Textured on both faces, these small retaining wall blocks can be used to create straight, curved and serpentine walls that are attractive from any angle. The two faces can be interchanged to create a unique look.
StackStone is ideal for terraced gardens, free-standing walls, raised planters, tree rings and gravity retaining walls up to 2'-0".
StackStone is a registered trademark of Risi Stone Systems.
http://www.mutualmaterials.ca/Professional_product_retaining_walls_stackstone.php