If you run HIC compression, you need the District HIC Compression System. HIC compression is a favorite of pro riders because it is inexpensive and simple to set up, emphasis on inexpensive. The HIC shim simply screws into the top of your HIC pro scooter forks via the supplied compression bolt, which makes it possible to run oversized bars with a slit and an oversized clamp.Made from durable delrin plastic fits oversized outer diameter bars ONLY with SLIT only 1.97" (shim) HIC Kit perfect for use with almost all HIC setups; fits any HIC compatible fork and oversize HIC bar with slit Includes shim, 30mm compression bolt, and compression cap