1、Applicable Model: Pinless accumulator piston kit fits for 4L60E 4L65E 4L70E Transmission. Please confirm whether your model is applicable before buying. 2、Package Contents: This set includes 3pcs pinless forward accumulators (FWD 1‑2 and 3‑4), 6pcs sealing rings and 6pcs steel balls. 3、Professional Design: Pinless design eliminates the possibility of pin leakage and the extra length stabilizes the piston and prevents it from cocking. 4、With Seal and Steel Ball: Double seals stabilize and completely seal the bore, providing a tight seal even after thousands of cycles. With steel balls for plugging existing pin bore in valve body. 5、Metal Construction: Transmission accumulators are constructed of high strength metal material, rugged structure, not easy to deform and rust.