The package includes - 120 pieces of sanders in 3 diameters: 1/2inch, 3/8inch and 1/4inch, 40 pieces per size, and 12 pieces sanding drum in 3 diameters: 1/2inch, 3/8inch and 1/4inch, 4 pcs per size; total 132 pcs Must-Have Accessory - 120 grit standard and standard size sanding bands used to smooth surface and curved edges , polishing both soft and hard materials, such as DIY, artwork and woodwork Easy installation - drum chucks with self-expanding rubber cushion, making the sanding bands close to the chuck firmly and achieving a better workmanship; In case the sanding band comes loose from the chuck during use, please make sure the drum has been screwed on tightly and is very close to the sleeve Note: Please wear safety goggles safety professionals to protect your eyes, because there may be lump particles when the sanding drum rotates at high speed; the sanding drum will be drawn to the metal surface faster, please replace the sleeves in time timely in order to achieve the best sanding effect Bonus - come with a free plastic box, convenient for store and retrieval