Here's some nice pulley wheels which save about 10g compared to standard Shimano wheels.
They have super long life, Delrin is the top material to be used and much quieter running than aluminium and much,much longer lasting than those fancy carbon pulleys. Double bearings(!) ensure smooth action and long life as well.
Shimano and Campagnolo compatible
Hyper accurate cnc'd out of Delrin
2 low friction , sealed industrial bearings per wheel