Pro Scooter Compression sets are for use with Threadless Forks and Threadless headsets ONLY! There are four kinds of scooter compression sets: Inverted Compression Systems(ICS) with a star nut in the bar. Standard Compression System (SCS) which doubles as a clamp, Hidden Internal Compression (HIC) system, and IHC (Integrated Headset Compression). SCS is considered the best, followed by HIC, IHC, and ICS.
Everything you need to know about Pro Scooter Compression