5 per lineal meter. Available in various colours--see below. A purpose-designed retaining wall system that’s easy to build and looks fantastic. These quality blocks are flexible enough to cope with 90 degree angles and steps and can be used for straight or curved walls. Available in a range of colours to suit your surroundings: Appin Stone, Bushrock, Charcoal, Opal White, Oakdale, Red Rock, Penrose and Yellow Rock. Easy enough for DIY, with great results!