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This collectioin includes 1 tie rod, 1 guide arm and 2 steering knuckles, which are frontend parts included in Chassis Kit CK1. All of these parts have one or more small diameter pins/posts, which if broken, render the chassis inoperable. They are vulnerable to being bent or broken during assembly but very unlikely to break during crashes while racing.
The guide arm can also be used in Chassis CK2 and CK3. The tie rod and steering knuckles are not interchangable with those in CK2, CK3, CK4, CK5, or CK6.
The 4 parts can be separated easily with a sprue cutter.