Pinewood Derby Car Body ONLY - Physic's Lecture by Derby Dust Precut- We already cut the design. Low profile, reduced drag. Every .001" counts in PWD. Front end tapered so that you can actually start down the track before others. Weighted-- We have weighted the bodies to around 4.3oz with lead and a COG between 1/2-1" in front of rear axles. Wood putty to weight holes All Amazon Prime Orders will be shipped BSA Slots only. This is the only stock they have. Options available: Pinewood derby car with either BSA slots, drilled BSA slot distance, or Drilled Extended wheel base if contact prior to purchase.