There are no attachments to hang these and they are made from 50% Polystyrene, 50% Acrylic (they are very light).
The dimensions appear in the product information online:
Small moon - £6 - 5029887
Dimensions: 4cm (D) x 11cm (W) x 13cm (H)
Giant moon - £65 - 5029888
Dimensions: 16cm (D) x 45cm (W) x 49cm (H)