I currently have the Pro-bolt Titanium bolts but switching to these. These are hollow Titanium bolts and will be lighter than the Pro-bolt item and any other on the market.
The stock steel bolts are hollow so these seem a good choice.
The stock bolts weigh in at 132 grams and the Pro-bolt ones are just 82 grams so already a nice weight saving on the front end. These bolts come in at just 66 grams! Thats nearly half the weight of the standard item.