Whether you are installing stairs yourself or hiring an installer, it is important that you have the materials you need to get the job done right. One of the pieces you need is the stair riser. While the tread is the horizontal piece, the riser is the vertical portion. Our stair risers, like this 3 ft Natural Strand, are made out of 100% solid strand bamboo - just like our floors. And just like our floors, you can expect the same hardness, durability, and high quality.