Material: stainless steel, exquisite manual polishing, fine workmanship 1 Set includes collar handcuffs and ankle cuffs There are 3cm Height set and 5cm Height set optional. Collar shape is circle (round),this shape is fixed. For handcuffs and ankle cuffs,there are 2 styles to offer, circle cuffs and oval cuffs. Size information: Circle Style: Female Size Kit: collar inner diameter 11.7cm, handcuffs inner diameter 5.3cm, ankle cuffs inner diameter 7.3cm, height 5cm/3cm, thickness 0.7cm. Male Size Kit: collar diameter diameter 13.7cm, handcuffs inner diameter 6.0cm, legcuffs inner diameter 8.0cm, height 5cm/3cm, thickness 0.7cm. Oval Style: Female Size Kit: collar inner diameter 11.7cm, handcuffs inner diameter 4.8*5.8cm, legcuffs inner diameter 6.8*7.8cm, height 5cm/3cm, thickness 0.7cm. Male Size Kit: collar diameter 13.7cm, handcuffs inner diameter 5.5*6.5cm, legcuffs inner diameter 7.5*8.5cm, height 5cm/3cm, thickness 0.7cm. 3CM whole set weight is about 2.5kg 5CM Whole set weight is about 4kg 1cm=0.4inch There is attached ring on collar and cuffs,support you to connect them by anyway according to your demand. 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.