They fit true to size, appear to have a flat inner edge, but the material is nice and thin along that edge (as it should be for easy attachment) and can be light stretched to fit any angle as long as it's not extreme. The material is a dense foam that feels durable like a rubberized surface. The surface is very closed cell so make sure you use a good glue or roughen the outer surface so it sticks to the paper cones. this). I don't have any speakers that need repairing so I can tell you exactly which ones will fit. But the definitions are correct, so measure your cones and baskets first.
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