Just got sent this set of weights from straightline performance. Pretty nice and very adjustable. Base weight is just shy of 48grams. Uses a combination of magnets, screws and washers. Can easily add over 20 grams to the base. I know the base weight looks like anodized aluminum, but it's steel.
http://www.straightlineperformance....doo-p-drive-adjustable-weight-kit-pn-121-235/
http://www.straightlineperformance....doo-p-drive-adjustable-weight-kit-pn-121-235/