Knob's useful to insert numeric values in a range.
<p:growl>
    <p:autoUpdate/>
</p:growl>
<h:form>
    <div class="card">
        <div class="grid text-center">
            <div class="field col-12 md:col-4">
                <h5 style="margin-top:0">Basic</h5>
                <p:knob value="#{knobView.value}">
                    <p:ajax listener="#{knobView.onChange}"/>
                </p:knob>
            </div>
            <div class="field col-12 md:col-4">
                <h5>Max-Min and Step</h5>
                <div class="knob-container  ui-corner-all">
                    <p:knob max="1000" step="50" value="950"/>
                </div>
            </div>
            <div class="field col-12 md:col-4">
                <h5>Show-Hide Label</h5>
                <div class="knob-container ui-corner-all">
                    <p:knob showLabel="false" value="65"/>
                </div>
            </div>
            <div class="field col-12 md:col-4">
                <h5>Label template</h5>
                <div class="knob-container  ui-corner-all">
                    <p:knob labelTemplate="{value}%" value="35"/>
                </div>
            </div>
            <div class="field col-12 md:col-4">
                <h5>Disabled</h5>
                <div class="knob-container ui-corner-all">
                    <p:knob disabled="true" value="85"/>
                </div>
            </div>
            <div class="field col-12 md:col-4">
                <h5>Cursor</h5>
                <div class="knob-container ui-corner-all">
                    <p:knob cursor="true" value="0"/>
                </div>
            </div>
            <div class="field col-12 md:col-4">
                <h5>Thickness</h5>
                <div class="knob-container ui-corner-all">
                    <p:knob thickness=".5" value="50"/>
                </div>
            </div>
            <div class="field col-12 md:col-4">
                <h5>Theme</h5>
                <div class="knob-container ui-corner-all">
                    <p:knob colorTheme="hot-sneaks" value="45"/>
                </div>
            </div>
            <div class="field col-12 md:col-4">
                <h5>Colors</h5>
                <div class="knob-container ui-corner-all">
                    <p:knob foregroundColor="#2196F3" backgroundColor="#495057" value="25"/>
                </div>
            </div>
        </div>
    </div>
</h:form>
package org.primefaces.showcase.view.input;
import java.io.Serializable;
import jakarta.enterprise.context.RequestScoped;
import jakarta.faces.application.FacesMessage;
import jakarta.faces.context.FacesContext;
import jakarta.inject.Named;
@Named
@RequestScoped
public class KnobView implements Serializable {
    private int value = 50;
    public int getValue() {
        return value;
    }
    public void setValue(int value) {
        this.value = value;
    }
    public void onChange() {
        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "You have selected: " + value, null));
    }
}