Size: the hair thinning comb is about 17.8 x 3 cm/ 7 x 1.18 inch, and the double sided razor is about 4.3 x 2.54 cm/ 1.7 x 1 inch; For better results, it's recommended to replace the razor regularly to give you a better hair cutting experienceWhat you will get: 5 pieces of dual side hair cutter combs and 20 pieces double edge razors that are made of quality stainless steel for stability and durability, enough for daily use and replacementMultiple usages: the hair razor combs are suitable for thin and hair cutting and styling, which are moderate for cutting hair, combing hair knot and can be applied to shortening, shaping, and thinning hairSafe to cut hair: the hair cutting razor comb features safety shielded razor that prevent cutting or scratching your skin when cutting or shaping hair, and the middle part of handle is designed concave for easy grip and better controlEasy to use: the double edge haircut comb's razor is detachable for easy replacement, both sides can be applied for cutting off hair, one side fine teeth and one side wide teeth; Smart DIY tool at home or in hair salon, convenient to use and portable to carry