A-1 Racing Products Aluminum Coil-Over Kit - 7" Sleeve - Fits Bilstein HB22031SPL it means that these are

it means that these are not suitable for open-top car racing or for karting

These filters are built durable to last for a long time

The smaller nozzle design helps accelerate airflow into the helmet

The Simpson Pilot Chute that fits all models

Product Description: MAC3

A-1 Racing Products Aluminum Coil-Over Kit - 7" Sleeve - Fits Bilstein HB22031SPL it means that these areMade of aluminum, these kits have slotted tops. A 1 Performance Plumbing is quickly becoming a leader in high quality competition plumbing. Quality, reliability and performance you can depend on. Product Description: Coil Over Kit 2. 500 in ID Spring 7 in Sleeve Aluminum Black Gold Anodized Bilstein 1 7 8 in Shocks