Do they make replacement sponges in this size?

D'Addario does not offer replacement sponges for this size. They do for the larger size for guitar, but not this size. Your choices would appear to be either buy the larger sponges (they're on here in packs of 3 - item GHRS) and cut them down to fit, or by another humidifier.

Hello, I have a form fitting case for my erhu (Chinese violin) and would need to know the exact dimensions of this humidifier to see whether it fits?

The humidifier itself is 3x2x1. 5x5x1.5 are the dimensions of its packaging.

Does this work in a soft canvass case?

Remember that the sponge needs to be damp but not soggy and the use of distilled water. I have used it in one of my soft cases and have not seen any mildew. I have been using the humidifier for only three months, during the summer, and so far it is what I needed.

Would this work for ukulele

Yes this would work great for a ukulele!

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D'Addario Small Instrument Humidifier

Product ID: 280355930

Details

Brand
Planet Waves
Capacity
0.03 Pounds
Colour
Original
Operation mode
Evaporative
Special features
Humidistat

🎸Compact size fits any case

💧Slow, even moisture release

🛡️Protects against cracks & warping

249 kr

Duties & taxes included

In stock

Sold byAmazon NorwayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Keep your sound flawless, your instrument flawless.

COMPACT PORTABLE - Small enough to fit seamlessly in any instrument case
GENTLE CONSISTENT - Sponge-style humidifier releases moisture evenly over time
EFFORTLESS MAINTENANCE - Simply moisten sponge when dry—no complicated setup
UNIVERSAL COMPATIBILITY - Safe for acoustic, bowed, and woodwind instruments alike
PRECISION HUMIDITY CONTROL - Maintains optimal moisture to preserve sound and integrity

The D'Addario Small Instrument Humidifier is a compact, sponge-based device designed to maintain ideal humidity levels inside smaller acoustic, bowed, and woodwind instrument cases. By releasing moisture slowly and evenly, it prevents damage like cracks, warping, and shrinkage, ensuring your instrument’s longevity and peak performance. Easy to use and portable, it’s the essential care tool for any serious musician’s collection.

Specifications

ASIN	B00839Z3MA
Brand Name	Planet Waves
Capacity	0.03 Pounds
Color	Original Version
Control Method	Remote
Country of Origin	USA
Customer Reviews	5.0 5.0 out of 5 stars (1)
Filter Type	Korbgeflecht
Global Trade Identification Number	00019954972554
Included Components	sponge
Item Dimensions D x W x H	25D x 25W x 25H millimeters
Item Shape	Irregular shape
Item Type Name	Guitar Cleaning And Care Product
Item Weight	0.03 Pounds
Manufacturer	D'Addario & Co.
Material	Sponge
Model Name	Planet Waves
Model Number	PW-SIH-01
Operation Mode	Evaporative
Other Special Features of the Product	Humidistat
Part Number	PW-SIH-01
Power Source	Corded Electric
Room Type	Bedroom
Runtime	1 minute
Smart Home Compatibility	Not Smart Home Compatible
UPC	019954972554
Unit Count	1.0 Count
Warranty Description	Replace if Defective

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