From the manufacturer's official website:

Modern project "bikini" technology (two pieces that really work together; in tandem). The first stem actually engineered for modern carbon fiber handlebars. Combination of two pieces: one alloy/one carbon to offer the best in lightness and to distribute stress on a wider surface area. Look coordinated with the most famous Deda products. Titanium 6/4 hardware.

Technical Data:

• Handlebar O.D.: 31,7 mm (Netwon standard)
• Fork steerer O.D.: 28,6 mm (1 1/8")
• Extension angle: 82°
• Tightening torque: for all bolts, 8 Nm (5,9ft-lb) (71in-lb)
• Weight (120 mm size): 137 grams

For more information, please visit this product's webpage.