Whisper's design accomplishes these major tasks:

1. No Serving Required!
2. Damps unwanted string vibration
3. Reduces noise
4. Increased arrow speed
5. Eliminates movement on the bowstring
6. It has a post extrusion for a rubber tube that aids in peep alignment.
7. The oval shaped hole increases light transmission and remains round optically at full draw
8. Since it doesn't move improved accuracy and shooting consistency
9. Available in 3 sizes: 3/16", 7/32", 1/4".