Is this sensory product sticky when received?

No,It has a small layer of non-toxic powder to make it not sticky ,you can sprinkle a little baby powder to remove the stickiness after washing .

Can it be used as a chew toy?

We don't recommend , It can only withstand light bite .

Are the 6 colors random or fixed?

You will get the red, yellow, green, orange, blue, and purple , But it will randomly appearing on every shape .

Is it easy to fall off pieces after use ?

NO, we have used the upgraded rubber material to make it not get to pieces after 10000+ stretches.

Is it fit for a 18 months baby ?

Yes, it can fit for 1-6 year old kids