a thick rubberised material?

I have identified asbestos in both Putty and rubberised sealants

I think It is either helium or air

Ans 2 = Blimps were made of rubberised fabric, a true blimp had no frame.

Framed airships, also called 'dirigibles' had a light metal frame and 'gas bags' of rubberised fabric within the frame .

Almost all of both kinds used helium as a lifting medium

Floors in gyms that are used for weight training are generally rubberised. This is to prevent damage to the floor if a weight is dropped from a height.

you need to pull the leads of holding the rubberised metal casing. wiggle it up and down as you are pulling. It is quite tight.