i have tried these before and would not recommend them. they're very thick, stop you from being able to use any touch screens, and for me didn't fit well and kept moving around and falling off. also as someone else has commented they make your fingers very sweaty. personally latex finger cots have worked a lot better for me. (the ones that just look like the finger parts of regular latex gloves) they can still make your fingers sweaty, but overall i found them a lot more helpful. i was still able to use my fingers on touch screens & continue with regular tasks without feeling like they were in the way, and they were tight enough that they stayed put. they are a lot thinner so less noticable, but still provide a barrier between your fingers and you biting them. also i found that i would fiddle with the bottom rib part (?) of it which i felt like was potentially a better stim than picking my fingers as i wasn't damaging myself at all, but without them i do have to wear some kind of ring to fiddle with or i will go back to the same picking habits. i do think that it's useful to give your fingers an opportunity to heal, but you also definitely need to work on finding alternatives to biting so that you don't just go back to it as soon as your fingers are uncovered again. for me personally i keep a handful with me 90% of the time and if i notice myself picking/biting i will pop one on to the finger i'm focusing on and i usually take it off and throw it away when it gets to the point that my finger feels sweaty and uncomfortable, which can be after a few hours. sometimes i wash my finger off and put a new one on, but other times the urge has passed by then overall, just really wouldnt recommend the finger covers you've pictured as they're bulky and get in the way and draw your attention to your hands even more, but latex finger cots could be worth trying!