Brazilian Grey Slate is the a 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