weapons for selfharm

so... my sibling is mentally in a bad state and theyve been doing selfharm. ive been their shoulder to cry on and listen to all their problems. i searched this up on google and no answers so ill ask here.

do you guys know any sharp weapons used for selfharm? i wanna put these weapons as far from my sibling as possible so they can stop. i love them with all my heart but i dont want them to get hurt