Weight: Approximately 23-29g Length: Approximately 8 cm These are domestically bred mice, not from Europe. 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 more than the listed quantity. Shipping will be via Kuroneko Yamato 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 shipping costs: We receive inquiries about including shipping in the product price. While it is possible to create a dedicated listing with the shipping cost added, the fees deducted from the shipping portion would result in a loss for us. If you wish to include shipping, the price will be the standard Kuroneko Yamato shipping fee plus a handling fee. Thank you for your understanding.