Weight: Approximately 23-29 g Length: Approximately 8 cm Regarding mice, we breed them for stock individuals that only eat our live mice. However, we have a surplus, so we are selling them. 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's Cool Takkyubin (refrigerated 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. Please note: We receive inquiries asking to include shipping costs. While it is possible to add the shipping cost to the product price and create a dedicated listing, the fee will be deducted from the shipping cost. This would result in a loss on the shipping. If you wish to include shipping, the amount will be the standard Kuroneko Yamato shipping fee plus a handling fee. Thank you for your understanding.