Are butterfly knives illegal in California?

Under Penal Code 21510 PC, butterfly knives are considered a form of a switchblade and are illegal in California. Specifically, it is a crime to carry, possess in public, sell, or otherwise transfer a butterfly knife. Convictions are misdemeanor offenses that carry up to 6 months in jail. Are butterfly knives illegal in California? In

9th Circuit overturns butterfly knife ban, citing Supreme Court gun ruling - Los Angeles Times

Reviews and Ratings for Benchmade 42 Balisong Butterfly Knife 4.2 Weehawk Plain Blade, Titanium Handles with Spring Latch - KnifeCenter

Is a butterfly knife considered a gravity knife? - Quora

Are Switchblades Legal in Your State? Know Your Rights - EKnives LLC

California legal balisong. : r/knives

How are butterfly knives and switchblades illegal in many countries yet you can buy a huge much deadlier chef/butcher's knife in utility store and carry it casually in a bag? - Quora

Caliber Gourmet Tactical Butterfly knife style Fork-Folding Stainless Steel Camping Hiking BBQ Grill Picnic Flatware Utensil : Sports & Outdoors

My 13 year old son wants to buy a butterfly practice/training knife. What are some good reasons not to allow him to get one? I've checked, and these knives are legal in