Thank you for viewing. This is a set of 4 Bianchi Carbon Ti bottle cage bolts. They only come with full carbon complete bikes and are a rare item not sold separately. They are lightweight and have a good design, so how about dressing up your road bike with them? They can be tightened with a Torx 20. - Brand: Bianchi - Material: Carbon/Titanium - Color: Blue - Quantity: Set of 4 These are personally owned, and there is a slight amount of thread locker or carbon debris from the carbon frame attached to the underside of the screws. There is no problem with installation, so please rest assured.