Littmann Snap Tight soft-sealing and firm eartips are available for use with Littmann stethoscopes. 
Littmann eartips offer excellent acoustic seal, increased comfort, durability, and a tighter fit to your Littmann stethoscope. 
A ribbed eartube on all Littmann stethoscopes offers a snap tight fit that won't loosen during routine use. Snap Tight soft-sealing eartips feature a surface treatment that increases surface lubricity for better performance and easier care.