This is the Shimano SLX M675 Hydraulic Disc Brakes – Ispec B Compatible. Shimano’ SLX M675 brakes are now compatible with the 2nd generation Ispec. This powerful brake features Shimano’s new short stroke Servo Wave mechanism, giving quicker engagement and 25% higher lever output and less free stroke for aggressive riding. This brake system has high power ceramic piston calipers for reliable and responsive braking. Easy and clean bleeding thanks to a one way bleeding caliper and the new funnel bleeding tool. The Shimano SLX M675 is an extremely adjustable system with a reach adjust dial for free stroke and position adjustment.