Livery Chainrings and Cogs

I won the Livery 50t Chainring for DFL at Hern's race on Tuesday. Can you believe no body picked the Cogs as prizes? Kids today. While everybody was grabbing T-shirts, I swooped on a 15t and 17t Cog from Livery, when it was time for the up for grabs leftover prize pile. These Cog are insanely lightweight, I mean it's kind crazy. They feel like there is nothing in your hand. Now I just need a Crankset, and the Felt could be back in working order, or a secret bike...