Weight: Approximately 11-15g Length: Approximately 6 cm These are domestically bred mice. Please understand that there may be slight variations in size and weight. We may have more in stock than the number listed, so please inquire if you would like to purchase more than the listed quantity. Shipping will be via Kuroneko Yamato's Cool Takkyubin (refrigerated/frozen delivery service). Please note that we may be slow to respond or unable to respond on Saturdays and Sundays. Also, we may not be able to ship on Saturdays and Sundays. Thank you for your understanding. Regarding the question of including shipping: While it is possible to add the shipping cost to the product price and create a dedicated listing, this would result in a loss on the shipping cost due to the commission fees. If you would like to include shipping, the price will be the standard Kuroneko Yamato shipping fee plus the commission fee. Thank you for your understanding.