"A ratchet is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Though something of a misnomer, ""ratchet"" is also often used to refer to ratcheting socket wrenches, a common tool with a ratcheting handle A ratchet consists of a round gear or linear rack with teeth, and a pivoting, springloaded finger called a pawl that engages the teeth. The teeth are uniform but asymmetrical, with each tooth having a moderate slope on one edge and a much steeper slope on the other edge. The Wooden Frog ratchet is made of rose wood and organic natural dye , with round edges which is totally safe for kids, it keeps your child busy and entertained. "