1、Ordinary standard card sleeve is about 1/3 shorter, gold‑plated interface, high‑speed transmission, support 64GB large capacity 2、This converter is made of materials in high quality, easy to use in the practical life, which makes itself getting great popularity 3、Plug and play, convenient and concise, it enables to support memory card, which can be used in confidence 4、High quality and good performance, it is a good choice for your card，dedicated to computer expansion 5、Widely used, can be used for business storage, backup files, also can be used for movies, music, pictures, software storage, etc Item Type: Secure Digital Memory Card Product Size: Approx. 24 x 23 x 2mm / 0.94 x 0.9 x 0.08in Applicable models: For Macbook AIR 13 For Macbook PRO 13 For Macbook PRO 15 For Macbook PRO 15 forRetina (2012 model) Note: Use in forMacbook PRO 15 forRetina will shrink a little, But it does not affect the use and removal. If you have any questions, you can first explain how to use it with the customer service For Macbook PRO 15 forRetina (models after 2013) models (will protrude 0.33CM. Think about it yourself) For Macbook PRO 13 forRetina model (will protrude about 0.55CM. Think about it yourself). Wait for the model of the laptop with secure digital memory card Not applicable models: For Macbook AIR 11: Because there is no secure digital memory card slot 1x Memory Card Card Cover