In its core, the current FSA SL-K stem consists of 3D forged and CNC machined 2014 aluminium. So FSA can finely control the amount of material used to cut weight. For a further weight optimization the 4 bolt faceplate and the included ahead top cap consists of UD carbon. For 31,8 mm oversize handle bars. Mounting hardware made of CrMo-steel. Inclusive 1 1/4 inches steerer adapter. 
CSI (Carbon Structural Integration) is a process that permanently bonds carbon to aluminium, to create a true hybrid product, with many of the benefits of aluminum and carbon.
Bar clamp: 4-bolt, detachable
| Product name: | FSA SL-K 6° 31.8 Stem - grey / black | 
| Manufacturer: | FSA | 
| Item code: | FSA406689 | 
| Activity: | Cycling | 
| Material: | Aluminium | 
| Usage bikesport: | Road Bike, MTB | 
| Steerer tube ø: | 1 1/8" straight ahead, 1 1/8"-1 1/4" tapered, 1 1/8"-1 1/2" tapered, 1 1/8"-1 3/8" tapered, 1 1/4"-1 1/2" tapered, 1 1/4" straight | 
| Handlebar clamp ø: | 31,7 / 31,8mm | 
| Stem clamping height: | 40mm | 
| Stem angle: | 6° | 
| Stem flip flop: | no | 
| Model year: | 2021 | 
| Color: | Black | 
| Stem direct mount: | no | 
| Weight: | 141g | 
| Weight source: | Manufacturer | 
| Manufacturer page: | http://www.fullspeedahead.com/ |