Disons que si on prend l’historique des mousses oui.
Maintenant il y a moins de versions utilisees
Sur ce forum il y a quelqu’un qui donne des explications sur les mousses http://mytabletennis.net/forum/forum_posts.asp?TID=79868&title=dhs-sponge-differences
#18 - Softer, (I think 37 degrees) elastic sponge that was used on the DHS Memo 2. It was more of a Japanese style sponge, and did not require tuning.
#19 - Older sponge version, it was available for a short while after the speed glue era. It was more yellow than the regular sponge, and was designed to be used with the DHS intensifier. It was just temporary, until NEO came out
#20 - Regular, orange sponge. It had the same number during the speed glue era, but it played differently. When NEO came out, DHS switched from producing the old #20 sponges to new ones. The old ones are no longer available unless you buy a really old sheet.
#21 - Old generation of blue sponge, meant for speed glue.
#22 - Blue sponge, meant for booster (only in provincial and national versions)
#50 - Red cake sponge, used on H3-50.
#60 - Tinarc cake sponge, it is soft (37 degrees) and yellow. It is elastic. It is used in TG3-60, Tinarc, and can also be found with an H3 national topsheet (used by Xu Xin for the BH)
#65 - White cake sponge (37-38 degrees). This is, to my knowledge, only found with an H3 national topsheet. Wang Liqin used this sponge and H3 on the backhand. A few sheets can still be found for sale, they are most likely fakes or training rubbers that were bought for WLQ when he was playing.