Philips Therapy Mask System 3100 NC and 3100 SP is an innovative tube-in-front CPAP Mask that lets you and your patients switch between a nasal cradle under-the-nose or silicone pillows cushion while keeping the same frame. Innovative, polarized magnets in the cushion and frame allow effortless assembly of the cushions to the frame. When patients feel the magnets click into place, they can be confident their cushion is correctly attached. The intuitive design with orientation markers for placement on the head can minimize patient mask errors that lead to callbacks, saving you time.