The IceCap 1in Biological Frag Plugs with Mounting Divot (25pcs) add a small recessed divot to the top of IceCap's porous ceramic plug, giving glue somewhere to pool and grip for a more secure initial bond — useful for oddly-shaped frags or ones that don't sit flush on a flat surface. Quantity: 25 pieces per bag Best for: Montipora, Zoanthids, Chalices, small SPS colonies, and Euphyllia (torch, hammer, frogspawn) Color: natural tan — blends into reef displays instead of standing out like bright white plugs pH: neutral (7-7.5), safe for reef and mixed systems The mounting divot is worth choosing over the flat-top version specifically for frags with uneven bases — the recessed pocket holds glue in place while it cures instead of letting it run off a flat surface.Use with: cyanoacrylate super glue gel (sold separately) for mounting.