Hot glue gun is commonly used in paper flower and other craft DIY. It provides fast and strong adhension, but please use with care as the heating power can cause burn. 
 
Hot glue gun:
Size small
20W, use 7mm diameter glue stick
Voltage: 100- 240V
Keep away from children. Always off it while not using.

Glue sticks :
7mm diameter, length ~30 cm
10 sticks per pack.