Handbuilt oyster shell dish, made from buff stoneware clay, hand painted with ceramic slip and fired before being glazed in food-safe glaze. External Dimensions. Small: approx 7cm width x 9cm length x 3cm height. Medium: approx 9cm width x 12cm length x 4cm height. Large: approx 12cm width x 15cm length x 4.5cm height. Handwash only. Due to being handmade, all shells will differ slightly.