The Supertech beehive valve spring kit for Honda F20 and K20A2 engines supplies beehive-style replacement springs matched to those cylinder heads. It provides a focused option for valve spring service or head rebuilds on F20/K20A2 applications. The kit description identifies it as a Supertech-specified beehive spring set intended to restore correct spring geometry for those Honda engines.
Supertech Honda F20/K20A2 Beehive Valve Spring Kit