5050 series 3 pedals have an aluminum/polycarbonate body, inner needle bearing/outer cartridge bearing and 10mm adjustable traction pins.
I ran a set of these for six months. The are very thin and pretty darn lightweight. The adjustable pins come out far and offer a lot of grip. This is an excellent pedal for a mildly aggressive rider. If you find yourself banging your pedals on rocks often, I'd find another platform. The inner needle bearing needs maintained every time you hit the mud/snow, and the spindle is soft metal that wore very quickly. The last bang resulted in a full 0.25" of free play that cannot be adjusted out. I give them 3 stars because I liked them a lot when they worked, but they lack durability.