Surepromise Clear Blank Acrylic Photo Keyring Insert Personalise - Plastic Blank Key Rings, manufactured to a very high standard and available for you to insert your chosen image.Whether this is for promotional purposes or home use, this is great set of Key Rings. Internal Measurements : 25mm x 35mm Overall Measurements : 35mm x 55mm Made from Clear acrylic Each key ring is packaged in it's own clear individual bag.