Size is approx; 10 by 10 by 10cmAdditional product info:A Shoulder Strap With An Acrylic Charm Attached! It comes in colors that match the image of Pokemon.[Compatible Smartphone Case Shapes]- Usable: The bottom center is open more than 12mm- Not Usable: The entire bottom is open[Installation Method]1. Set the strap sheet in the smartphone case and let the sheet’s tab come out of the case.2. Attach the smartphone to the case.3. Attach the carabiner to the bottom of the sheet.