California Code
ARTICLE 7 - Regulation of Contests
Section 18724.

18724. All professional and amateur boxing contests or matches shall be performed on a ring floor and padding which meet at least the following specifications:

(a) The ring floor shall be constructed of 11/4 inch plywood.

(b) The ring floor padding shall be of 13/4 inch thickness consisting of closed cellular foam in combination with high density polyvinylchloride (PVC) bonded together in solid sections, or equivalent covering.

(Repealed and added by Stats. 1985, Ch. 1092, Sec. 2.)