BNB Block Company Inc of Williamsport, PA produces and distributes the finest masonry products available. BNB Block Company Inc offers a line of products including Rockwood Retaining Wall Block in a variety of colors. BNB Block Company Inc offers concrete blocks, chimney blocks, landscape pavers, patio pavers, cements materials, masonry materials, fireplace materials, and lintels.. Concrete Blocks; Chimney Blocks; Landscape Pavers; Patio Pavers; Cements Materials; Masonry Materials; Fireplace Materials; Lintels