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.

ASIN	B00839Z3MA
Best Sellers Rank	#23,772 in Musical Instruments ( See Top 100 in Musical Instruments ) #113 in Guitar Cleaning & Care Products
Brand	Planet Waves
Brand Name	Planet Waves
Capacity	0.03 Pounds
Colour	Black
Control Method	Remote
Country of Origin	USA
Customer Reviews	1.5 out of 5 stars 2 Reviews
Filter Type	HEPA
Global Trade Identification Number	00019954972554
Importer Contact Information	Gretex Audiotech LLP
Included Components	1N ACCESSORIES
Item Dimensions D x W x H	100D x 40W x 80H Millimeters
Item Shape	Irregular shape
Item Type Name	Accessories
Item Weight	12 g
Manufacturer	D'Addario & Co INC, D'Addario & Co INC
Manufacturer Contact Information	D'Addario & Co INC
Material Type	Plastic
Model Name	PW-SIH-01
Model Number	PW-SIH-01
Operation Mode	Ultrasonic
Other Special Features of the Product	Humidistat
Packer Contact Information	Mihika Enterprises, H.NO 402, Mangolpur Kalan, New Delhi - 110085
Power Source Type	Ultrasonic
Product Dimensions	100D x 40W x 80H Millimeters
Room Type	Bedroom, Living Room
Runtime	1 minute
Special Feature	Humidistat
UPC	019954972554
Unit Count	1 Count
Warranty Description	No Warranty on Accessories

D'Addario Small Instrument Humidifier

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