Size is approx: 10 by 10 by 10cmAdditional product info:Acrylic Charm Shoulder Strap!The colors match the image of the Pokmon.[Compatible Smartphone Case Shapes]- Usable: Bottom center open by 12mm or more- Not usable: Bottom fully open[How to Attach]1. Set the strap sheet in the smartphone case, and let the sheet tab stick out of the case.2. Insert the smartphone into the case.3. Attach the carabiner to the bottom of the sheet.