What is the inner diameter?

With sufficient air, 37" is 17 ", 45 inches is 18 ", and 50 inches is 20 ". The more the air pressure, the smaller the inner diameter.

The product's title indicates "Rubber" but the spec cites "neoprene" which is a synthetic rubber. Which is it, real butyl rubber or synthetic?

It is synthetic, best I can tell. However, it is not the actual size (much smaller) and I sent mine back.

What is the maximum weight on the 49" tube?

I really don't know because we use this in our pool when we winterize it. However, there is, at times, a tremendous amount of weight on the cover and therefore the tube when there is water on the cover.

Item weight	7 Ounces
Age range (description)	Adult
Occupancy	1
UPC	747832277643 733444566299 733444229026
Color	Black
Material Type	Neoprene
Included Components	Tools
Batteries Included?	No
Department	unisex-teen
Manufacturer	ZANGEROI
Item model number	ZANGEROI
Package Dimensions	51.89 x 30.71 x 11.99 cm; 198.45 g
ASIN	B0B5115MP3

River Tube for Floating Heavy Duty Rubber Snow Tube | River Tube, Sledding Float | Pool Closing Inner Tube | Truck Inner Tubes

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