Semetall 12 Pcs 0.83 Inch Silicone Chair Leg Caps Floor Protectors Round Furniture Table Feet Covers,Preventing Scratches and Noise (Transparent)

15mm = inside or outside dimension?

Where are these made please?

Does this stretch? Chair legs are 1/2" one side of rectangle-shape, 4/5" on other side of rectangle-shape. (i want it tite, but still needs to fit.

Do they stretch at all