The chestpiece has interchangeable bells (3 sizes: adult, pediatric and neonatal) and diaphragm assemblies (2 sizes: adult and pediatric). The headpieces are Chromed-Brass compact design to allow ease in listening without compromise in sensitivity. We have many color choices available, black, blue, dark blue, light blue, green, purple and pink. Black will be assumed if no preference is made. Tubing made of polymers (mostly polyvinyl chloride aka "PVC") without any natural latex rubber.