Features: Small handy wheels with printed days, weeks and months Clearly shows the 1st day of last period, probable ovulation, probable implantation, expected date of confinement etc Simply rotate the wheel by dragging and move the pointer to select LMP Made of quality ABS material, lightweight and durable Suitable for expectant parents, midwives, fertility clinics etc Specification: Item Type: Pregnancy Wheel Material: ABS Color: Gray Product Size: 10. 8x10. 8cm/ 4. 25x4. 25" Quantity: 8pcs Note: Please allow 1- 3cm ( 0. 4- 1. 18" ) difference due to manual measurement and slight color variation for different display setting. Package Including 8 x Pregnancy Wheel Small handy wheels with printed days, weeks and months Suitable for expectant parents, midwives, fertility clinics etc Made of quality ABS material, lightweight and durable Simply rotate the wheel by dragging and move the pointer to select LMP Clearly shows the 1st day of last period, probable ovulation, probable implantation, expected date of confinement etc Small handy wheels with printed days, weeks and months Suitable for expectant parents, midwives, fertility clinics etc Made of quality ABS material, lightweight and durable Simply rotate the wheel by dragging and move the pointer to select LMP Clearly shows the 1st day of last period, probable ovulation, probable implantation, expected date of confinement etc