5 Sizes--The size is about 18cm/7 inch long, 2cm/0.8 inch wide, they are available in 5 different thickness sizes, namely 2mm, 3mm, 4mm, 5mm, 6mm, the inner diameter of the flipchart ring is 6.3cm/2.5 inch. You can choose the appropriate size according to your needs Package Include--This clay depth guides set includes 10pcs acrylic rods, 5 sizes, 2pcs/size, and includes iron loose-leaf binder hinge rings, plenty enough to meet your daily DIY needs Acrylic Material--This clay worker are made of black acrylic material, strong and durable, not easy to break, the ring is made of iron, can be reused, is your best companion for making clay artwork Easy to Use--You just need to choose the right thickness, then put the clay in the middle of 2 rails of the same thickness, fix the clay and roll the rolling pin to get a piece of flat clay of the desired thickness Thoughtful Design--We have printed thickness markings on one end of the rolling depth guides so you can easily distinguish between them, and with holes on the other end, you can store these guides using the included iron loose-leaf ring.