The K66 profile is the most common rubber cushions on the market. These pool table cushions will last for years and have the popular K66 profile. The MBS rubber is known in the industry as the "pink" rubber. MBS cushions are made out of 65% natural gum rubber and have a 48-52 durameter. These are available as sets of 6 in either 8' (42") or 9' (48") set of six. If you have a 7 foot table, it's very common to buy the 8' (42") rubber set and then just cut them down.