GRAB A SLICE AND GO! Our White Pizza Slice Window Clamshell is a triangular, single-use, clamshell food container made from premium SBS paperboard. The window clamshell holds one 9" pizza slice. Easily see the quality and toppings on the pizza through the extra-large window. Featuring a side tab-lock for easy, secure closure which means no spill in your take-out bag or car! Our window pizza slice clamshell is made in the USA and recyclable* where facilities exist.