Image 1 of 2 Image 2 of 2 1:87 HO Scale Cinder Blocks (20pk) $10.00 Unpainted, 3D printed cinder blocks for HO scale scenery. Package includes total of 20 pieces. Quantity: Add To Cart Added! Unpainted, 3D printed cinder blocks for HO scale scenery. Package includes total of 20 pieces.