Description Are you looking for a professional, yet affordable oxygen pump membrane? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? If yes, look no further! Our professional oxygen pump membrane must meet you needs. It is one of the best choices for you. Features - Color: Black. - Size: 3.5 x 3.5 x 1.5 cm. - Material: Silica gel. - The membrane is made of silica gel, has good aging resistance. - Used in the water treatment industry for years and has proven performance. - Suitable for aquarium air oxygen pump. - It is durable, cleanable and easy to use. - Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! The membrane is made of silica gel, has good aging resistance. Used in the water treatment industry for years and has proven performance. Suitable for aquarium air oxygen pump. It is durable, cleanable and easy to use. Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you!