Harkness Cosplay Pendant Necklace for Agatha Harkness Costume (40cm)Size: For accurate manual measurement, select a size based on the size chart before purchasing (1 inch = 2. 54 cm, 1 cm = 0. 39 inch). It's advisable to choose a size that is slightly larger rather than smaller. Included: Necklace Washing Instructions: 1. Avoid using alkaline detergents such as soap and washing powder. 2. Use cold water and a neutral laundry detergent; do not soak and wash separately from light colored garments. 3. Suitable for both