Duro Flat tops Type PPSI PT 52 (MCH52) 520 PT 45 (MCH45) 450 PT 42 (MCH42) 420 PT 36 (MCH36) 360 PT 33 (MCH33) 330 Made of Micro-alloyed steel with extra hardened point (EHP)We are using Multi-layer Foundation in the cotton Fabric construction , with covering layer ofa elastic natural rubberThe setting pattern is sparse at the fibre entry point and towards the exit . The gentle action assures better remonal of trash and neps and avoid fibre ruptureHardened at the tips of the hooks prolongs its life .High technology in backing-off grinding / side grinding to get smooth finish high sharpness for better carding . Twill Flat tops Type PPSI MCB55 550 MCB52 520 MCB45 450 MCB38 380 MCB30 300 Made of high tensile wireEnhanced resilience of pinsGood quality surface to avoid fibre loadingImproved fibre opening and removal of neps and trash .