Stripes refers to the bruising caused by whipping or scourging.
Jesus was scourged prior to crucifixion.
Isaiah 53:5 But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed.
1 Peter 2:24 Who his own self bare our sins in his own body on the tree, that we, being dead to sins, should live unto righteousness: by whose stripes ye were healed.
1 Peter 3:18 For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:
Isaiah 53:12 Therefore will I divide him a portion with the great, and he shall divide the spoil with the strong; because he hath poured out his soul unto death: and he was numbered with the transgressors; and he bare the sin of many, and made intercession for the transgressors.
Hebrews 9:12 Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption for us. 13 For if the blood of bulls and of goats, and the ashes of an heifer sprinkling the unclean, sanctifieth to the purifying of the flesh: 14 How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?
Scourging prior to crucifixion was part of the death sentence carried out by the Romans.
Mark 15:15 And so Pilate, willing to content the people, released Barabbas unto them, and delivered Jesus, when he had scourged him, to be crucified.
Christ, being without sin, voluntarily suffered and gave his life to redeem the faithful of all ages from their sins.
The ‘healing’ is the reconciliation to, or restoration to fellowship with, God through the forgiveness of sin.
Romans 5:7 For scarcely for a righteous man will one die: yet peradventure for a good man some would even dare to die. 8 But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us. 9 Much more then, being now justified by his blood, we shall be saved from wrath through him. 10 For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life.
To avail ourselves of this reconciliation, and receive forgiveness of sin, we must understand, believe, and obey the gospel preached by Jesus and his apostles.
If our sins are forgiven, we will be raised from the dead to eternal life when Christ returns to establish the Kingdom of God on the earth.
I hope this helps.