I did not find any odor from mine. I even just smelled them to be sure. No smell at all.

They look very well made & pretty self explanatory or is there a special exercise I need to do with them?

Are these the same as the dryer balls sold at the grocery store in the laundry supplies? The look like the dryer balls.

is the green one soft or are both balls hard?

The green is softer than the red and larger. I love it for back rubs. It is soft enough that it can be moved over shoulder blades and spine without pain.

Soft vs Hard - does this describe the softness/hardness of the spikes, or does soft vs hard describe hollow vs solid?

It describes both the hardness/softness of spikes and how "squeezable" they are. The hard ball is not pliable at all--very hard. The soft ball is flexible--just the right amount for me.

ASIN	B018STZSAG
Best Sellers Rank	#96,627 in Health & Personal Care ( See Top 100 in Health & Personal Care ) #97 in Massage Balls
Brand	Therapist's Choice
Colour	Green,red
Customer Reviews	4.4 out of 5 stars 2,962 Reviews
Is Product Cordless	Yes
Manufacturer	Therapist's Choice®
Massage Therapy Technique	Vibration
Massager Form	Massage Ball
Massager form	Massage Ball
Material	Polyvinyl Chloride
Model number	No Model
Product Benefits	Blood Flow Control
Product Grade	Home
Style Name	Classic
Target Use Body Part	Back
UPC	815290013681
Use for	Back
Water Resistance Level	Not Water Resistant

Therapist's Choice ® Pack Of 2 Spiky Massage Balls, Hard & Soft Combo, Stress Reflexology, Porcupine Sensory Ball Set

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