Black Diamond DISTANCE SPIKE TRACTION DEVICE BD37000 - Brand: Black Diamond Size: M Thank you for viewing. I purchased this in October 2022, but I have never had a chance to use it and it has been stored at home. I haven't even tried it on. There is a white powder-like substance on the rubber, but this was present from the time of purchase and is not dirt. It has been stored in a bag in a dark place, so as far as I can see, there doesn't appear to be any obvious deterioration of the rubber, but please understand that this is a home-stored item before purchasing.