Package includes: enough for you to use and replace, also it is a good choice to share with your families and neighbors About size details: the outer diameter of roller ring is . 8.7 inch/ 22 cm, the inner diameter of it is . 8.1 inch/ 20.5 cm, the wheel of edge is . 0.59 cm/ 1.5 cm in diameter, proper size for supporting glass tray material: these tray rotating support rings are made of high quality material, temperature resistant and decay resistance, safe and to use, durable and have a -span Widely compatible: the turntable rotating support ring is suitable for serving as turntable bracket base, widely compatible with most microwaves, good replacement for your broken tray rotating support rings Model Number: Oven Parts colour:Photo color Material:PPS Package Contents: 4 x Roller Ring Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.