MASK COMBO SET BS/BK IST GREAT "FOR SCUBA DIVING & SNORKELING" mfg from high qulity silicone and temper glass a great choice for price and confort!! The Snorkel is high qulity with a splash guard that reduces water fron entering the tube and for easy clearing a purg valve at the bottom and the best part is the snorkel designed is tapered not round like most snorkles this design reduces water resistance alleviating tension on the mask eliminating mask leaks.