how many cassettes are in a box?

Hello, the $28.51 price is for a package of 10 HMEs in the factory sealed pack. The $85.81 price is a box of 30 HMEs, 3 packs of 10 each.

what is the difference between this item and the 7290?

I don't know, the 7290 is what was issued from hospital.

What are the dimension of this ?

Dimensions were provided by Life and Health (see answer #1). This product is designed to fit in the Provox XraBase, Adhesive base plate. These products were designed and created for persons who have had Laryngectomy's, so they can filter the air going into their lungs, and so they are able to speak with a voice prosthesis.

ASIN	B014I0DFZY
Best Sellers Rank	#243,700 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #5 in Respiratory Heat & Moisture Exchangers
Customer Reviews	4.4 4.4 out of 5 stars (10)
Date First Available	July 5, 2015
Is Discontinued By Manufacturer	No
Manufacturer	Provox Atos XtraFlow HME

TL7291BX - Heat and moisture exchanger

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