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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Brand	D'Addario Accessories
Color	Original Version
Floor Area	0.01 Units
Item Weight	12.25 Grams
Room Type	Office, Living Room, Bedroom
Model Name	Planet Waves
Manufacturer	D'Addario &Co. Inc
Part Number	PW-SIH-01
Item Weight	0.432 ounces
Product Dimensions	5 x 1.5 x 5 inches
Country of Origin	USA
Item model number	PW-SIH-01
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Number Of Pieces	1
Batteries Included?	No
Batteries Required?	No
Warranty Description	Replaced if defective.

Planet WavesSmall Instrument Humidifier

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