Sorry what input do you need? They are a small thick tile slip ok for outside. Look at river Island they sometimes have them on some of the stall risers and columns. Quite a hard slip high glaze, normally used with a wide joint like a brick.
I'm going to use s1 to fix. They're glazed and I believe prone to crazing so was wondering if they need treating/sealing. I tried ringing pyrolave but they said they didn't know