Promate Raven Frameless Mask Promate Raven Frameless Scuba Dive Mask/ MK500: Frameless design reduces weight and teardrops shapes provides better view of both upward and downward. Flexible swiveling, and easy adjustable buckles system makes fit a wider range of faces than traditional frame mask. Promate Dry Snorkel with colored whistle housing/ SK890: The fully submersible dry top snorkel with one way purge valve. Quick disconnect and rotatable retainer design easily make accommodation of snorkel from mask. About Shipping and Handling Charge including Tax, please check the Shopping Cart during checkout. Free shipping may apply ONLY in some circumstances.