Size:

Heart Long: tag length 7mm, width 5mm, chain length 50mm, weight 0.4g;

Heart Short: tag length 7mm, width 5mm, chain length 25mm, weight 0.3g;

  Drop Long: tag length 8mm, width 4mm, chain length 50mm, weight 0.4g;

Drop short: tag length 7mm, width 3mm, chain length 25mm, weight 0.2g

Note: The size and weight are measured manually, so there will be some indirect measurement errors.