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Smith's Bible Dictionary
Frontlets. Exodus 13:16; Deuteronomy 6:8; Deuteronomy 11:18; Matthew 23:5. These "frontlets" [Old Testament] or "phylacteries" [New Testament] were strips of parchment, on which were written four passages of Scripture, Exodus 13:2-10; Exodus 13:11-17; Deuteronomy 6:4-9; Deuteronomy 6:13-23, in an ink prepared for the purpose.
They were then rolled up in a case of black calfskin, which was attached to a stiffer piece of leather, having a thong one finger broad and one and a half cubits long. They were placed at the bend of the left arm. Those worn on the forehead were written on four strips of parchment, and put into four little cells within a square case on which the letter was written. The square had two thongs, on which Hebrew letters were inscribed. That phylacteries were used as amulets is certain, and was very natural.
The expression "they make broad their phylacteries," Matthew 23:5, refers not so much to the phylactery itself, which seems to have been of a prescribed breadth, as to the case in which the parchment was kept, which the Pharisees, among their other pretentious customs, Mark 7:3-4; Luke 5:33, etc., made as conspicuous as they could. It is said that the Pharisees wore them always, whereas the common people only used them at prayers.
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Smith, William, Dr. Entry for 'Frontlets'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/f/frontlets.html. 1901.