This might be a very efficient 0.4 module (or 64 pitch metric) nylon spur gear set usable on Tamiya 1/10 on-road models (F1 and GTP show). Includes: 1- 93 enamel 0.4 module spur gear 1-104 enamel " " " " Requires: aluminum engine mount, 0.4 pinion gear- TAMC7375 (20t+21t), TAMC7280 (22t+23t), TAMC7380 (24t+25T) or TAMC7395 (26t+27t)