This is a circle of silicone cover on the old model of Sony earplugs. Compatible with many models, I can't test them one by one. It seems that customers reported that E931 is not compatible. Other models should be compatible The price is a pair of Shipping Terms We only ship to the confirmed address provided by PayPal. Before you pay, please make sure your address in PayPal matches the address you would like us to ship to. ? We ship items to Worldwide Buyers' Information: We strive our best to provide you the most reliable, affordable way of shipping service. But sometimes international delivery is highly depended on the courier company and local customs/duties. If you do not receive your item on time, please contact us immediately for further assistance. Thank you for your understanding. Shipping Method We use China Post and Singapore Post delivery. Items are generally shipped out the next business day after your payment has been cleared (Sat. Sun. excluded.). We offer combined shipping which will save your shipping cost greatly for your multiple purchases. Please do not pay until you make your last purchase. International Buyers - Please Note: Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying. Customs fees are normally charged by the shipping company or collected when you pick the item up. These fees are not additional shipping charges. Shipping Time All items will be shipped within 72 business hours upon receipt of payment (except Saturday and Sunday). ? It takes about 15-90 days to ship to United States, Canada,Russia, Europe, Asia or other places worldwide. ?