These are blocks of spent mushroom substrate used for shiitake cultivation. * Recommended for providing nutrition to rhinoceros beetle larvae. * Usable for both domestic and foreign rhinoceros beetles. * Can be used as a substitute for egg-laying logs for stag beetles. * Can be used in various ways, such as burying or mixing into the substrate. * It is also possible to make fermented substrate with this product. * Mixing into the field provides fertilizer and soil improvement effects. 【Size】 * Height: Approximately 12cm x Width: 10cm (average) * There may be some variation. 【Quantity】 * 8 pieces 【Shipping Method】 * Will be shipped in a cardboard box, protected with newspaper. * Small insects may be mixed in. Thank you for your understanding.