Thank you for viewing! Product Details: * 14 blocks of used mushroom substrate made from 100% domestic Japanese oak (kunugi). * Suitable for making insect breeding mats. * For reuse experiments and substrate research. Features: * Safe and reliable, made from 100% natural Japanese oak. * Easy to handle in block form; mixing into soil improves soil quality. Product Details: * Used mushroom substrate blocks for shiitake cultivation, made from 100% domestic Japanese oak. * These blocks have already been used for shiitake cultivation, and shiitake production has finished. * Can be used for ornamental purposes, reuse in home gardens, composting, gardening, etc. * The blocks will be completely dry. Soaking them in water for a full day will make them easier to break down. --- Size and Quantity: * Height: Approximately 13cm * Diameter: Approximately 10cm * Quantity: Set of 14 (see photos) --- Important Notes: * Shiitake production is not guaranteed due to the used substrate. * Variations in shape and color may occur due to the use of natural materials. * Will be shipped in simple packaging, wrapped in newspaper. ---- Shipping: * Will be shipped in a cardboard box, protected with newspaper. * Shipping via Rakuraku Mercari or Yu-Yu Mercari services is planned.