CiaraQ Bottle Cleaning Brushes, 8 Inch Nylon Tube Brush Set | Navy Blue Cleaner for Narrow Neck Bottles Cups with Hook, Set of 10pcs.

Key ring keeps them together All 10 brushes attach to a key ring for easy storage. Stainless steel body with nylon bristles and a rubber tip (no bristles on top) to protect tube bottoms.
10 sizes for any tube Diameters: 2, 3, 4, 5, 6, 8, 12, 16, 20, 24 mm (1/16" to 1").
Bristle length: 1.92. 8".
Overall length: 8". Gets deep into tight spots.
Fits tight spaces Great for cleaning narrow tubes, pipettes, lab glassware, reusable straws, and other hard-to-reach small holes.
Use them for all kinds of jobs Works as bottle brush, glass cleaner, straw brush, pipe cleaner, gun brush, keyboard cleaner, coffee tool brush, feeding tube brush, soft wire brush, and more.
Safe & scratch-free Rubber-tipped head and soft nylon bristles won't damage glass, plastic, or metal surfaces.