[Ring Sizer Mandrel Introduction]: The ring mandrel includes 4 sizes of US 2-15, EUR 41-76, UK D-Z+5, HK 1-36, which can meet the measurement needs of different sizes of fingers. [Finger Sizing Gauge Introduction]: The blue ring size gauge including US Size of 0-13 and UK Size A-Z with Half Size.("7 O" is US size 7, UK size O. "-7 P" is US size 7.5, UK size P etc.) [Ring Size Belt Introduction]: 4PCS ring sizer belt made of durable plastic, measures fingers from 1-17 (US size), works like a belt that you adjust around the finger. [Ring Size Adjuster Introduction]:The Ring Size Adjuster will make your ring smaller without resizing. Moreover, it fits both women and men rings. Colour:Black+blue Material:Metal + plastic Package Contents: 2 x ring sizer mandrel 2 x finger sizing gauge 4 x plastic ring sizer belt 4 x ring size adjuster Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.