From the manufacturer

The Rattlesnek Kej is made from a single sheet of lightweight 5052 alloy. Its sinuous body puts the squeeze on your water bottle while diamond cutouts make this cage nice and light. The side entry design works well for all frame sizes, and because the Rattlesnek Kej is available with the opening on either the left or right, you can access bottles from the same side of your bike when you have Rattlesneks mounted on both your downtube and seat tube.

Features

• Constructed of 5052 alloy
• Includes two stainless bolts for installation 
• Weight: 54 g (1.9 oz)
• Lifetime PDWarranty