How to lower the size of an icon?

I'm endeavoring to change the icon of a mouse when equipping a tool. This works, however once I equip the tool the icon is too big, is there a way to modify the icon's size?

Script:

tool = script.Parent

playerMouse = game.Players.LocalPlayer:GetMouse()

tool.Equipped:connect(function(mouse)

mouse.Icon = "http://www.roblox.com/asset/?id=995283023"


end)

Note: Just began figuring out how to script Mouse. I chose a random decal.