Second series of coins issued during the reign of HM King Rama 5 are known as the Monogram - Wreath (จ.ป.ร. - ช่อชัยพฤกษ์) coins as the obverse carries the royal monogram จ.ป.ร. (pronounced as Cho Po Ro) while the reverse consists of the denomination and year within a wreath.
Denominations issued were 1 Solot (1/2 Att), 1 Att, 1 Sio (2 Att) and 1 Sik (4 Att). All denominations are copper coins. 1 Att coins made of Nickel are reported to exist but are very very rare. Refer to my previous post Thailand: Circulating coin denominations to understand the denominations.
Note that these are also the first coins where C.S. or จ.ศ.(Chula Sakarat จุลศักราช) dates appeared. See Thailand: Coin Dating.
Click to see Checklist of Monogram-Wreath coins.