This is a set of stone materials for seal engraving, which was my grandfather's hobby. I would be happy to pass it on to someone who can make good use of it. The seal portions are all uncarved. I do not have specialized knowledge of stone materials, so I cannot answer specialized or detailed questions. I will answer general questions to the best of my ability, so please feel free to ask. I am sorry, but I cannot sell only a part of the set. Thank you for your understanding. Thank you for your consideration. - Material: Stone - Shape: Various shapes of seal materials - Color: Multiple colors (green, red, gray, etc.) - Usage: Seal materials for seal engraving - Quantity: A large set of seal materials Thank you for looking.