The base cannot be used alone. (Two inserts are required to swap inserts).▶︎Use This is a custom part to allow one-touch replacement of the bottom of the GPX SL2.You can use different mouse soles for different play titles and mouse pads. Also, since there is no need to peel off the mouse sole, the risk of damage when replacing the mouse sole can be avoided. ▶︎ Details of each item Socket base: This is the side that attaches to the mouse body Insert (A type): This is the side that is replaced (normal type) Insert (B type): This is the side that is replaced (meatless type) Screw: This can be fixed if you are worried about the insert falling out, for example. ▶︎ Weight Socket base: 5g Insert (A type): 6g Insert (B type): 3g Reference: Bottom part in stock condition: approx. 10g (bottom part 8g + lid 1.7g + magnets 0.6g)