Product description Laryngeal Mask Airways for single use is made from the medical grade material, have excellent biocompatibility. The products have 5 types: Normal PVC Laryngeal Mask Airways-ONE WAY, Normal Silicone laryngeal mask-ONE WAY , Reinforced PVC Laryngeal Mask Airways-TWO WAY, Reinforced Silicone laryngeal mask-TWO WAY, Reinforced Silicone laryngeal mask-ONE WAY).