Clamps that tighten and feel strong

As said in many other reviews:
- Tighten these clamps strong
- And rubber tips give off a powerful odor (and unpleasant)
Since yesterday, they take the air on the balcony, hoping the smell dissipates (I fear not completely)

I'll see to use their quality.

[Edit 08/01/2014]
A month later, the smell has not disappeared, it's just a bit less strong and heady ...