Fits into the corners of bottles and removes tea stains and coffee discoloration. ◆ Uses a 3-layer laminated sponge with hybrid particles to remove tea stains and discoloration. ◆ Sturdy handle designed specifically for stainless steel bottles. ◆ Sponge shape easily fits into the corners of the bottle's bottom. ◆ Replaceable sponge for hygiene and economy. ■ Made in Japan