30/40/50/60KG Power Twister Flexible Arm Strengthen Bar Chest Resistance Spring Bar

description":"Features:  Perfect for building upper body strength. Quality carbon steel springs and non-slip plastic handle. Strengthens the chest, back, shoulders, biceps and grip. Suitable for people: young, adult, beginners, chest exerciser, chest and arm builder. A portable exercise device that is great for home, office or travel use.    Specification: Material: Spring Steel Color: Silver + Black Options: 30kg / 40kg / 50kg / 60kg (Optional) Spring Length: 27.4cm / 27.6cm / 29cm / 29.2cm Spring Dia.: 0.5cm / 0.6cm / 0.7cm / 0.8cm Gripper Dia.: 3.5cm / 3.5cm / 3.8cm / 3.8cm Total Length: 59cm / 60.5cm / 63.8cm / 64.2cm Weight: 1.3kg / 1.5kg / 1.8kg / 1.9kg   Package List: 1 * Power Twister   Reference only: 30kg(Strong),40kg(Professional),50kg(Trainer),60kg(Strongest)