http://www.ittf.com/stories/pict ... verings_BoD2011.pdf
1.3. Sponge
The use of sponge (i.e. cellular rubber) is governed by The Law 2.4.3.
Translucent red racket coverings
may not be used over dark sponges or dark blades, and
translucent black ones may not be used over light sponges or light blades.
紅色面膠不透光便 ok.
