Material: stainless steel, exquisite manual polishing, fine workmanship 1 Set includes collar handcuffs and ankle cuffs Size information: Male Size Kit: collar diameter diameter 135mm, handcuffs inner diameter 60mm, ankle cuffs inner diameter 80mm, height 25mm, thickness 7mm. Female Size Kit: collar inner diameter 120mm, handcuffs inner diameter 53mm, ankle cuffs inner diameter 73mm, height 25mm, thickness 7mm. 1cm=0.4inch Customize service is available for this kit, if you need other sizes of this kit, please contact me for further details, customization would cost a little bit extra fee. please note that due to all steel gear is handmade,it is unavoidable that a little size error exsits.Around 0.2cm size error on diameter should be accepted.