Fringe Supply Co. : Removable Stitch Markers
Slender and elegant in antiqued brass, they do their job without getting in your way. Pin one in each increase/decrease in a series so you can see at a glance what you've done. They also work for anything you'd use a standard safety pin for.
Packaged in sets of 20 in sturdy kraft envelopes (with resealable flaps!), adorned with actual-size drawings. Each marker is 22 mm (7/8 in) long and fits up to 6.5mm / US 10.5 needle.