Sandalphon is the archangel "twin-brother" of Metatron. Sandalphon is said to be responsible for determining the gender of a person in one's embryonic state, and in other accounts said to be a guardian angel who delivers prayers to God.
Sandalphon is regarded as the master of heavenly songs and it is said that a human would take 500 years to walk the length of his body alone clearly showing his celestial size. Gabriel even once stated that he witnessed a human walking on his ear lobe, which took roughly around 70 years to reach the end.
Sandalphon is described as the "dark angel" as opposed to his twin brother Metatron whom is regarded as the bright angel. However, this means not that there is conflict in their relationship as they do get along and care deeply for one another.