Inner diameter Size(mm):  54mm-62mm.

According to body weight select the internal diameter:  {There are errors in this type of measurement. It is recommended to  follow the palm measurement method more accurately, see at the product  picture.}

Inner diameter 54mm: suitable for weight 35-40 kg.

Inner diameter 56mm: suitable for weight 40-45 kg.

Inner diameter 56mm: suitable for weight 40-45 kg.

Inner diameter 58mm: suitable for weight 45-55 kg.

Inner diameter 60mm: suitable for weight 55-65 kg.

Internal diameter 62mm: suitable for weight 65-70kg