Strafe, weighing four catties, needs a whip head of 80cm. Two fingers wide, whip tip 60 to 80 cm. 1.8kg Fitness Whip is two fingers thick, the length of whip tip is 60-80cm, the length of two tips is 50-70cm, the length of whip handle is 20cm, and the weight is 0.5-2kg, which conforms to human mechanics and can be used for better fitness. Fitness whip is mainly composed of stainless steel chain+wool whip+wool strip. There are juvenile models, adult models and old models with different lengths and weights, which can be tailored according to personal preferences. Therefore, Strafe, weighing four catties, needs a whip with a length of 80 cm.