There is no other material that can match Tungsten for Low CG, ease of assembly, and precise balance.
You can spread these out, or stack them altogether and only use a 0.5"x 0.75"x 1.6" area for over 100 grams (3.5 oz).
Assembly is a breeze with 3M VHB Tape allready on the back of the parts. This tape is used instead of rivets and spot wielding in many applications. It leaves NO residue like lower cost "hobby" double sided tapes. Many racers are discovering better handling with lower CG weights from TxW.

Summary- Lower cost than Pine-Car 3 oz, better COG, and much easier assembly to derby car