This good design bath book, usually have 4 title for the bath book.

Here is the details info for the Bathtime Books,

Book size: 150 x 150mm, 8 pages include cover, materials by 0.2mm EVA and 7mm foam.

The round tube for toys: H150mm x diameter 65mm. 

Materials 0.2mm EVA, inside also 7mm foam.

connect the Net and EVA by the transparent PP, closer by VELCRO.

Bathtime Books printing by offset printer.