The Cisco twingig converter module offers investment protection for 10 Gigabit Ethernet switches such as the Cisco Catalyst 3750-E and 3560-E Series switches by enabling migration from Gigabit Ethernet to 10 Gigabit Ethernet uplinks based upon business needs, without having to upgrade the switches. Product Dimensions 3.62 x 1.52 x 0.76 inches Item Weight 9.6 ounces ASIN B000OT3PY0 Item model number CVR-X2-SFP