I purchased these weights to use on Pinewood Derby cars at an event at our church. Many of our entries were severely under weight and would not make it to the end of the track. Adding weight up to the maximum allowable helps make the race more competitive. Yes, you can purchase weights made specifically for Pinewood Derby cars and I did for a comparison. I found these weights comparable to those made for Pinewood Derby cars and I received many more weights for the same price. These weights are lead-free which is a requirement for me.The adhesive worked great and the size (0.25 oz) made them perfect for my use. Yes, I recommend these weights and will definitely purchase again next year.