Combat ring space

The RuneScape Wiki also has an article on: rsw:Combat ring space

Combat ring space
Released								31 May 2006 (Update)
Members								Yes
Quest								No
Location								Player-owned house (combat room)
Options								Build
Examine								You can build a combat ring here.
Advanced data
Object ID								15277, 15278, 15279, 15280, 15281, 15282, 15283, 15284, 15285, 15286, 15287, 15288, 15289, 15290, 15291, 15292, 15293, 15294, 15295

Combat ring space is a hotspot in the Combat Room of a player-owned house that is only visible to the player when in building mode.

Creation Menu

Key	Level	Combat ring		Materials	Experience	Cost
1	32		Boxing ring	Oak plank x6 Bolt of cloth x4	420	5,736
2	41		Fencing ring	Oak plank x8 Bolt of cloth x6	570	8,202
3	51		Combat ring	Teak plank x6 Bolt of cloth x6	630	9,846
4	71		Ranging pedestals	Teak plank x8	720	6,480
5	81		Balance beam	Teak plank x10 Steel bar x5	1,000	10,120