The Substrate Tray comes in a choice of 4 sizes to suit the ReptiBreeze you have, and is completely removable and washable.
Nano - 25 x 25cm (for use with NT9 - 25x25x40cm)
Small - 38cm x 38cm (for use with NT10 - 40x40x50cm, and NT11 - 40x40x76cm)
Medium - 45cm x 45cm (for use with NT12 - 46x46x92cm)
Large - 60cm x 60cm (for use with NT13 - 61x61x122cm)
ReptiBreeze also offer a stand for their cage, which you can find here.