these are made of hard plastic to further protect the dust seal and the main oil seal on the forks

and frankly

Individually tested tools as per IEC 60900 at 10

Sticky compound in shoulder area for cornering stability & traction

GPR Exhaust - Ultracone Inox Cafè Racer Silencer without Link Pipe for Kawasaki KZ 550 - 1989 to 1993 Supplier-HPCorse these are made of hardGPR's Ultracone series is direct from the races with a super sporty look. It is made of hand brushed 304 stainless steel, with visible TIG welds on the cone, a graduated endcap and cone shape. It has a diameter of 70mm. Product Features SOUND: Upgraded sound from stock exhaust PERFORMANCE: Upgraded performance from stock exhaust QUALITY: Italian made with high grade welding WEIGHT: Lighter than stock exhaust Technical Specifications Shape: Conical