The bolt is made from a nylon-like materaial and is light than even delrin. Velocity is increased due to less force required to move the bolt. The bolt has a cupped face to gently push the ball forward. No venturi producing higher flow. No oil. This bolt is self-lubricating like the delrin, but can take moisture and oils without swelling.
The Bandit Bolts Excellerator 6.0 & 5.0 Bolt is older, so while it may be available used and in a few cases new, it is not commonly available anymore.