Proto-Full-Knuckle SCS V2 Oversized 4" (Gold) Playlife We value our riders’ safety

We value our riders’ safety

An old school style and shape that blend's Pro-tec's modern helmet features

An aluminum frame improves performance by adding more power transfer and durability

Sold as 8 per pack

support and value

Proto-Full-Knuckle SCS V2 Oversized 4" (Gold) Playlife We value our riders’ safetyThe PROTO Full Knuckle SCS is the original and first Standard Compression System. It fundamentally changed the way a freestyle scooter was built and effectively revolutionized the freestyle scooter after market parts industry. The Full Knuckle SCS is still the strongest and most universally compatible SCS ever created. The Full Knuckle SCS is built to perform and last and carries a lifetime warranty on cracking. Made of High Grade 6061 T6 Aluminum.