Our Sunfire Ceramic flap disc is equipped with upgraded features:Diameters of 4-1/2", 5", and 6"5/8" x 11 or 7/8" Spin-On arborMultigrain 40/60 Grit, or 80 gritComes in packs of 10Made in Germany, our new line of flap discs are designed with an internationally protected unique formula for optimal grinding, blending, & finishing. Our flap discs are eco-friendly, requiring 50% less energy to produce, and the flaps are usable, right down to the backing. The backing plates are plant-based and made from hemp, absorbing vibration, heat & sound, all while being more impact resistant versus fiberglass