... treads:1.Color: grey, white, black, yellow, green, red, brown and etc.; 2.Standard Size: Step,100-150x33cm, Riser,100-150x17cm ... sizes are available upon request; 3. Normal thickness: 2cm, 3cm and ect.; 4. Finish: Polished, honed, flamed, sandblasted, bush-hammered, anti ... , paving stone, curbstone, monument, etc Natural stone stair treads with low price and A grade