Titanium bolts, spec below. Price $10 for 2. Black color. New. M4x18 (2,01 g / 0,068 oz) Made of the Best Titanium Alloy 6AL4V (Grade 5) 62% Lighter Comparing to Stainless Steel Screws Fine Finishing High Strength, High Toughness and Excellent Corrosion Resistance Easy Installation by Exchanging Screws one by one Torx Head socket