The Team Associated RC10B74.1 Aluminum Center CVA Cup is an optional upgrade for the RC10 B74.1 and B74.1D Team 1/10 4WD Electric Buggy Kits. Replace the center CVA cups with 7075 aluminum over the kit steel version to shed rotating weight for faster acceleration. Savings of 4.7 grams rotating weight total (2.0 grams vs. 6.7 grams total per car). Package includes two CVA cups.