The f5 Designs FlatBead series are beads with internal cavities for tritium vials, unique in the market and completely impossible to make by machining.
The oval hole fits two 550 paracords side by side and the beads are very suitable for lanyards.
FlatBeads are made to fit 3 pcs 1.5x6.0mm tritium vials from Veleno Designs (not included)
Colors, prices and ordering info can be found here. When ordering, it is wise to specify that you are purchasing vials for a Renegade Productions product.