What material are the bristles made of?

I have no way to verify this, but the sellers' information says they are made from "coconut silk." As you can see in the images there are stiff yellow bristles and a few of the brushes have soft white (feel more cotton-like) strands at their tips.

Will these hold a bend to clean a humidifier?

Hi Customer, These brushes are flexible, can bend and clean at various angles. If you have any question and need any help please contact our seller service and click" Contact Seller". Thank you! Our standard for responding to email quests is less than 24 hours, and we look forward to hearing from you! Best regards, MASTERTOP Support Team

Could these be used for a humming bird feeder? The one feeder I have is narrow opening/wide container the round brush seems to be one I would use.

Absolutely you can use these brushes for a humming bird feeder. I use the largest one that appears to have a "hook" on the end. The feeder I have, the bowl part is narrow at the top and then flares at the bottom (then you turn it upside down when you hang it). That brush gets it sparkling clean, whereas before all I could do was put the soap in and shake it and hope for the best. I have had these brushes for well over a year now and they are wonderful. I keep them in a large glass container on my counter near the sink. Use them at least every other day!

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9 Pieces Bottle Brush Set - Long Water Bottle and Straw Brush Cleaning Set

Product ID: 155958555

Details

Brand
MASTERTOP
Color
Rice White
Handle Material
Polypropylene
Product Dimensions
13.39"L x x
Specific Uses For Product
Bottle Cooker

🌀flexible twisted wire design

🌿natural pig hair bristles

🧼9 versatile brush sizes

30627CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧽 Elevate your clean game — because every bottle deserves a glow-up!

SPACE SMART STORAGE - Each brush features a hanging loop for easy, organized kitchen or bathroom storage.
TRUSTED QUALITY SUPPORT - Backed by 1-year replacement and 24/7 customer service for worry-free cleaning.
ALL IN ONE CLEANING ARSENAL - 9 brushes tailored for every bottle shape and size, from narrow necks to wide mouths.
SAFE SUSTAINABLE MATERIALS - Durable, BPA-free natural pig hair bristles ensure a non-toxic, scratch-free clean.
EFFORTLESS REACH FLEXIBILITY - Twisted wire handles bend to clean awkward angles without scratching surfaces.

The MASTERTOP 9 Pieces Bottle Brush Set offers a comprehensive cleaning solution with 9 BPA-free, natural pig hair brushes in various sizes. Its flexible twisted wire design reaches every nook and cranny without scratching, perfect for baby bottles, coffee grinders, teapots, and more. Lightweight and equipped with hanging loops, this set combines durability, safety, and convenience, backed by a 1-year replacement guarantee and responsive customer support.

Specifications

ASIN	B07VRM3Y27
Best Sellers Rank	#74,602 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #157 in Tube Cleaning Lab Brushes
Brand Name	MASTERTOP
Color	Rice White
Customer Reviews	4.4 4.4 out of 5 stars (1,090)
Handle Material	Polypropylene
Included Components	Ring
Item Dimensions L x W x H	13.39"L x 4.53"W x 2.76"H
Item Highlight	BPA Free Bottle Cleaner Brush for Baby Bottle Pipes Coffee Grinder Teapot Narrow Neck Wide Mouth Water Bottles
Item Weight	0.11 kg
Material Type	Iron, Polypropylene
Number of Items	1
Other Special Features of the Product	Hanging Hole, Hanging Loop, Lightweight
Product Firmness	Soft
Shape	Round
Specific Uses For Product	Bottle, Cooker, Dish, Straw, Water Bottle
Surface Recommendation	Glass, Plastic, Stainless Steel, Porcelain, Wood, Narrow Neck, Wide Mouth
Theme	bottle brush
UPC	725756049966
Unit Count	1 Count

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