Avail 75S HS Gear Set for 2501C Type 2 Button 75S-HGST (Push Type)

Material: Pinion gear: Brass / Main gear: Two types: Brass and Extra-super duralumin / *Pinion gears made of extra-super duralumin are not manufactured. Weight: Pinion gear: 1.7g / Brass main gear: 13.3g / Extra super duralumin main gear: 4.7g Gear ratio: 6.1:1 (winding amount 57cm) HGST2501 compatible model: 2501C only Changes: Gear ratio changed (6.0:1 → 6.1:1) Gear twist angle changed / Maximum winding amount increased (56 cm → 57 cm) / Laser engraving (engraved on the back of the gear) *Comparison with the old Avail high-speed gear and pinion gear.