This is a Warhammer Old World: Modular Movement Tray set

This kit allows you to assemble movement trays of different sizes for use with any unit in Warhammer: The Old World, be they monstrous infantry, cavalry, or regular infantry.

This set includes the following plastic components:

2x 200mm x 200mm floor sections
32x corner pieces
48x straight pieces

The set also includes a construction manual to aid with assembly.

Guidance for unit bases sizes can be found in Warhammer: The Old World - Ravening Hordes and Warhammer: The Old World - Forces of Fantasy, both available separately.