Weight: Approximately 11-15g Length: Approximately 6 cm Regarding mice, we breed them for stock individuals that only eat our live mice, but 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 stock than the number of items listed, so please inquire if you wish to purchase more than the listed quantity. Shipping will be via Kuroneko Yamato Cool Takkyubin (refrigerated/frozen delivery service). We may be late in responding 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, in that case, a commission will be deducted from the shipping cost, resulting in a loss for shipping. If you wish to include shipping, the price will be the standard Kuroneko Yamato shipping fee plus a commission. Thank you for your understanding.