These are some of the highest quality instruments available in the field of IASTM. FAKTR instruments are hand poured and polished, not cut from a mold like many others, which creates a perfectly shaped instrument each and every time they're created. This instrument is made of 316L surgical stainless steel and is 7 3/4 inches in length and 1 7/8 inches in height. It weighs 6 ounces. There are 2 convex surfaces, one on the top and one on the bottom with 2 concave surfaces also on the bottom and top. At each end, there are 2 tips with edges, approximately the same size.All edges are double-beveled for ease of treating in multiple positions and for changing direction of strokes--adding comfort for the practitioner as well as the patient. Each FAKTR instrument is specially designed to treat the entire body so there is no need to purchase an entire set to get results. These instruments come directly from FAKTR, Inc. and have only been used in our hands-on courses. No scratches, blemishes or dents are on any treatment surface, merely on the face of the instrument. These still carry our lifetime replacement guarantee: If for any reason your instrument ever has a dent or blemish on a treatment edge, you can send them back for a full replacement for the lifetime of the instrument.