Free shipping in the US 4500 RPM Ball Bearing 50mm Wide by 50mm by Tall by 15mm Thick Blower fan Velcro disks for installation all fans are shipped in anti-static bubble wrap and sealed bags All my kits can be powered by USB power banks, like the kind used for charging phones and tablets. Two fans can run non stop for over 2 hours on a small capacity 2200mAH power bank. and much longer on larger capacity power banks, depending on what you have room for. Feel free to message me if you have any questions!