This product is available in the following size: 21 3/4″ x 3 3/8″ x 13 7/8″ (in). Pisa Smooth is a new segmental retaining wall system providing a linear modern aesthetic to any landscape project. The ideally sized block provides fast, efficient installation, with great contractor friendly features. Pisa Smooth features the ability for both battered (slight lean) retaining, or completely vertical orientation, for a versatile range of installation options. Easily create garden or large retaining walls, two-sided seat walls, pillars, planters or almost any other vertical element.