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

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€ 15.74

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Keep your sound flawless—humidity handled with care!

EASY MAINTENANCE - Simply moisten sponge when dry for continuous protection
COMPACT PORTABLE - Small size fits seamlessly in any instrument case
GENTLE MOISTURE RELEASE - Sponge-style humidifier ensures slow, even hydration
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 optimal performance. Lightweight and easy to use, it’s the essential accessory for any serious musician protecting their investment.

Specifications

ASIN	B00839Z3MA
Color Name	Original Version
Customer Reviews	5.0 5.0 out of 5 stars (1)
Date First Available	2 September 2012
Item Weight	12.2 g
Item model number	PW-SIH-01
Material Type	Sponge
Power Source	Corded Electric
Product Dimensions	12.7 x 3.81 x 12.7 cm; 12.25 g
Size	1

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