KOBRA 240.1 C4Kobra 240. 1 C4 classic line shredder comes with sturdy steel gears and metal chain drive system which offer reliability and resistance to wear, carbon hardened steel cutting knives unaffected by staples and clips. Motor thermal protection: 24 hour continuous duty motor without overheating and duty cycle. It can shred up to 17 sheets at a time in 3,5 x 30 mm (P 4) cross cut. Equipped with Energy Smart system power saving stand by mode after 8 seconds