This is cut log wood that was used for shiitake mushroom cultivation for 3-5 years. It is domestic Konara oak log wood. How about using it for insect breeding? As shown in the photos, there are variations in size, diameter, length, the extent of mycelial growth, and individual differences. It has been dried in the sun for several days before being listed. Insects may be present. If you are concerned, please heat treat before use. ◯ Size Length: Approximately 14 cm to 15 cm Diameter: Approximately 7 cm to 7.5 cm 11 pieces per set ◯ Hardness It is soft enough that a toothpick can be inserted, such as near the bark. * The shiitake mushroom cultivation log wood has well-developed mycelia throughout, including between the bark, and is well-rotted. * Can also be used as food for larvae of beetles, etc. * Some people use it as a perch for adult insect breeding. ◯ Notes * Because it is fully ripened wood, some parts of the product may be easily broken, so please handle it with care after receiving it. * Occasionally, some Quercus serrata wood may be mixed in. * Since it has not been treated for miscellaneous insects, please perform heat treatment before use if you are concerned. * Due to the nature of the product, changes in size and texture, cracking, peeling of bark, and the growth of mold and moss may occur over time. * Shipped via anonymous delivery. * This is a personal listing, not a business. I cannot answer specialized questions. Please refrain from purchasing if you are looking for perfection. Please purchase only if you agree to the above. Please ask if you have any questions.