This slide rule measures approx. 7-1/2" long X 1-1/8" wide.  The inner piece slides freely in the outer piece.

This is all plastic.  It is (very) slightly yellowed due to age.  There is one ink mark on the back and a couple of very small dark marks on the back.

If you purchase multiple items from me, I will be happy to combine shipments to save you money on shipping costs. Please request an invoice prior to paying.