Standard Postcard-a standard postcard mails First Class at current rate of 35Â¢. The smallest maiLabel size for ANY postcard is 3Â½â³ x 5.â³. The largest postcard size for mailing at the 35Â¢ rate is 4Â¼â³ x 6.â³. The paper thickness must be at least 0.007 â³ and not more than 0.016 â³ in thickness.
1 Prohibits head first diving in water depths less than 8 feet. 2  Restricts use of starting blocks to competitive swimmers or swimmer training activities.  Requires new installation (effective October 7, 1992) of starting blocks to be in the deep end in at least 6 feet of water.
1 Free diving or breathhold diving, where the diver completes the dive on a single breath of air taken at the surface before the dive. 2  Snorkel allows breathing at the surface with the face submerged, and is used as an adjunct to free diving and scuba. Rebreather, closed-circuit or semi-closed-circuit scuba. 2  Free diving or breathhold diving, where the diver completes the dive on a single breath of air taken at the surface before the dive. 3  Snorkel allows breathing at the surface with the face submerged, and is used as an adjunct to free diving and scuba.