1.flat back with 2 holes 2.High quality 3.No lead,no nickel 4.other color can be customized One -Stop ... and exquisitely made 3.Available in various designs and color 4.Nickel free and lead free,low cadmium 5. ... 10.Logo:Offset,Screen printing,coloring,laser,embossing,etc . up to you. Color card to match: Other pattern acrylic stone to choose ... if out of stock 2 holes round acrylic button with AB color