They are single-sided SPD pedals, made by Ritchey, compatible with the common 2-bolt mountain SPD cleat. Note that there are two different, much larger road SPD cleats (SPD-SL ), that are not compatible with these.
The early clipless Shimano pedals were licensed copies of Look Delta. When they brought out the SPD type for MTB it was followed shortly by tiny Ultegra and Dura-Ace models with MTB cleats. They disappeared quickly from the market. Mainly because the range of available road shoes for two-bolt cleats was limited and the tiny contact surface put too much pressure on the soles.
Your pedals are compatible with SPD mountain cleats. Buy the ones with uni-directional release to avoid unexpected untimely release.
A word of caution: Be aware that when used with thicker soled MTB shoes, the pedals will sit deeper in the soles which in turn could hinder a smooth and safe release. Shims under the cleats could be required. In any case, check for easy and safe release before entering traffic.