Strontium MicroSD Class 10 8GB Memory Card (Black) With mobiles literally becoming our life-saving gadget, whether to click pictures or to play music or to watch videos requires a lot of space. In order to save annoyance of the phone beeping of low storage, Strontium Mobile memory cards are the perfect solution. Strontium Mobile memory cards also offer an impressive storage capacity ranging from 2GB to 256GB as external storage apart from the internal storage available on your phone, which would suffice consumers to store high quality data.