Hi sleepykitty,
They're from Ebenex. Got a couple free with pedal purchases and decided to buy a few more so I can have my pedals all lined up in a single row. I believe they're the same ones at Ranking (Prolink), a pack of 5-6 for $20++. You can also buy them at $5 each at Ebenex. Cheap but work well.
Cheers,
Ray