This hide can be used under the bedding so you can easily observe your hamster sleeping and doing his hamster-activities without disturbing them. 
Comes in three sizes :
(we do not recommand the small version for syrian hamster)
S : 21 cm x 10,8 cm x 8cm
M : 28cm x 13,5cm x 11cm
L : 36cm x 16cm x 14cm