Brazilian Black Slate is the most popular slate option. The Brazilian slates are known for their gentle surface. The clefts are quite fine and so do not affect chair legs and so forth.
4 size small opus pattern consists of 600 x 400, 400 x 400, 400 x 200 and 197 x 197mm
Non Calibrated to 10-12mm thickness.
Available in an array of sizes including patterns and strips