As a grower, you have to where a ridiculously small cage. When I am erect I am about 18 cm (7in) long and 5 cm (1,9in) thick, but I have to where a cage that is 5 cm (1,9in) long with a ring that has a 4 cm (1,5in) diameter.
I put him in his "Teasing cage" and had a lot of fun with him. He even got the chance to "fuck" me. This cage is absolutely useless for every day use, but for teasing and playtime it's just perfect.