Natural stone stair treads Advantages: 1). Factory direct, Quarry owner 2). Ten years experience. 3). Good packing Natural stone stair treads: ... .Color: grey, white, black, yellow, green, red, brown and etc.; 2.Standard Size: Step,100-150x33cm, Riser,100-150x17cm, other sizes ... , monument, etc Natural stone stair treads with low price and A grade