This is a replacement Align Landing Skid Nut Set, and is intended for use with the Align T-Rex 450SE, SA, XL, Pro and Sport helicopters.
Material: Silica gel
Weight: 0.3g ea
This product was added to our catalog on November 5, 2010
Hmm - price... You pay 3$ for 4 small rubber/silicone pieces.
Nobody forces you to by them though :)
I am sure you can get similar quality for 1/3 price somewhere, but regarding quality - I have not (ab)used them much, seems strong as expected, slides on 5.5mm tube with quite a force, but that means also holds well.