Do you want to be trendy all the way, but you don't know how? Convince yourself of the coffin shape. Thanks to it, your hands can be full of fantasy. You can also stay elegant with the coffin shape and the baby boomer technique. What is the coffin shape on the nails? Who can have this form? Keep reading! What is the coffin shape for my nails? “Coffin” is not very glamorous. We can refer to this form by the term “ballerina”, because it is reminiscent of a classic ballet slipper. The nail is long and tapered, but filed square on the free edge.