[Material and Design]:This Badminton Racket Trainer is made of quality stainless steel with a wooden handle,ensuring durability and comfort during your training sessions [Adjustable Weight]:The trainer features a removable weight structure,allowing you to adjust the heaviness according to your training needs.Different numbers of weights simulate the swing weight of different rackets [Strength Training]:This trainer helps to improve arm strength,making it a good tool compatible withbadminton players who want to enhance their performance on the court [Weight Equivalents]:Six weights are equivalent to the swing weight of a 3U racket,five weights are equivalent to a 4U racket,and four weights are equivalent to a 5U racket [Application]:Great compatible withbadminton preheating,stretching.Convenient compatible withindoor or outdoor sports,such as corridors,balconies,parks,gardens,offices,etc Specifications: Material:Stainless steel and Wood Size: Total length 39cm/15.35inch,handle length 21cm/8.27inch Note: Please allow slightly errors 1-2cm differences due to manual measurement. Package included: 1 Badminton Swing Training Aid