Clutch Kit - Uprated Stage 1 - Black Diamond - Supra MA70 NABlack Diamond Uprated Clutch Kit Stage 1 for Supra 3. 0 MA70 NA 236mm, 3 piece clutch kit includes, cover, plate and release bearing The stage 1 clutch kit is recommended for vehicles with up to 20% increase in torque above standard. The clutch disc has a spiral woven glass fibre friction material with a heavy copper core. The glass fibre is a fairly soft material which allows for a smooth engagement of the clutch and consistent performance from low