iFixit Manta Driver Kit 112 Bit Driver Kit Aluminum Precision

Two-sided chestpiece with tunable diaphragms on both the adult and pediatric sides
Single-piece tunable diaphragm is easy to attach, and easier to clean because its surface is smooth without crevices
Pediatric side converts to a traditional open bell by replacing the single-piece diaphragm with a non-chill rim

Anatomically designed headset, Angled eartubes align with ear canals
Two-in-one tube design (dual lumen) eliminates noise from two tubes rubbing together
Pressure-based sound frequency adjustment with tunable diaphragm