Review on 🧹 5ft Long Flexible Drain Brush Cleaner Kit - Elastic Double Head Nylon Cleaning Brushes + 3pcs 10” Straw Brush for Aquarium Water Filter Pipe Hose Air Tube Fish Tank Tub Sinks Glass Vase - Enhanced SEO by April Nelson

They work when there is a small problem with the drain, for example when you need to remove hair or something similar from the drain. The metal is very malleable so you can't just glue it straight down as it's so soft it bends and bends every time you try to drag it down the drain. So I don't think this product will work for deep drain problems, but something just on the surface like a bathroom drain will work perfectly, or even your bathtub, it will work great. But I think for a kitchen sink with deeper plumbing this might not work due to the softness of the medal.