This unique Star of David is engraved with a sentence from Psalms 91:
10 There shall no evil befall thee, neither shall any plague come nigh thy tent.
11 For He will give His angels charge over thee, to keep thee in all thy ways.
12 They shall bear thee upon their hands, lest thou dash thy foot against a stone.
The whole chapter deals with keywords that protect us from various problems.
This model of the Star of David with this sentence is made for enhanced protection.