From the manufacturer:
"SpeedyMoto sliders are made from superior and more expensive HDPE plastic, which slides and absorbs impacts better than any other product on the market. Other materials tend to grip, flip and brake.
Works with a standard rear stand so you can service the bike easily.
Easy installation, only takes minutes.
Anodized aluminum rod and stainless hardware holds both side firmly together and won't corrode!
Front Axle Slider fits: Ducati 848-1198, SF1098, MTS 1200-1260, M show contact info
, HM 821-939, Supersport 939"
These have less than 500 miles on them. They came on a 1260 Multistrada I bought with 3,500 miles, and he put them on at the 3k oil change. $80 each new, but I will sell both for $60 total.