diff --git a/src/Diagrams/TwoD.hs b/src/Diagrams/TwoD.hs
index e9383e00..dcaa4ac9 100644
--- a/src/Diagrams/TwoD.hs
+++ b/src/Diagrams/TwoD.hs
@@ -153,12 +153,12 @@ module Diagrams.TwoD
        , tailStyle
        , shaftColor
        , shaftStyle
-       , HeadSize, headSize, headSizeA, getHeadSize, setHeadSize
-       , TailSize, tailSize, tailSizeA, getTailSize, setTailSize
+       , HeadSize, headSize, headSizeA, getHeadSize
+       , TailSize, tailSize, tailSizeA, getTailSize
 
          -- * Text
        , text, topLeftText, alignedText, baselineText
-       , font, fontSize, italic, oblique, bold, setFontSize
+       , font, fontSize, italic, oblique, bold
 
          -- * Images
        , Image, image
diff --git a/src/Diagrams/TwoD/Arrow.hs b/src/Diagrams/TwoD/Arrow.hs
index acde5974..826f2a71 100644
--- a/src/Diagrams/TwoD/Arrow.hs
+++ b/src/Diagrams/TwoD/Arrow.hs
@@ -72,8 +72,8 @@ module Diagrams.TwoD.Arrow
        , arrow'
 
          -- * Attributes
-       , HeadSize, headSize, headSizeA, getHeadSize, setHeadSize
-       , TailSize, tailSize, tailSizeA, getTailSize, setTailSize
+       , HeadSize, headSize, headSizeA, getHeadSize
+       , TailSize, tailSize, tailSizeA, getTailSize
 
          -- * Options
        , ArrowOpts(..)
@@ -103,6 +103,7 @@ import           Control.Lens             (Lens', Setter', Traversal',
                                            makeLensesWith, (%~), (&), (.~),
                                            (^.))
 import           Data.AffineSpace
+import           Data.Data
 import           Data.Default.Class
 import           Data.Functor             ((<$>))
 import           Data.Maybe               (fromMaybe)
@@ -286,7 +287,7 @@ tailSty opts = fc black (opts^.tailStyle)
 
 -- | Radius of a circumcircle around the head.
 newtype HeadSize = HeadSize (Last (Measure Double))
-                 deriving (Typeable, Semigroup)
+                 deriving (Typeable, Data, Semigroup)
 instance AttributeClass HeadSize
 
 type instance V HeadSize = R2
@@ -301,19 +302,16 @@ instance Default HeadSize where
 
 -- | Set the radius of the circumcircle around the head.
 headSize :: (HasStyle a, V a ~ R2) => Measure Double -> a -> a
-headSize = applyTAttr . HeadSize . Last
-
-setHeadSize :: (Measure Double) -> Style R2 -> Style R2
-setHeadSize = setAttr . HeadSize . Last
+headSize = applyGTAttr . HeadSize . Last
 
 headSizeA :: (HasStyle a, V a ~ R2) => HeadSize -> a -> a
-headSizeA = applyTAttr
+headSizeA = applyGTAttr
 
 getHeadSize :: HeadSize -> Measure Double
 getHeadSize (HeadSize (Last s)) = s
 
 newtype TailSize = TailSize (Last (Measure Double))
-                 deriving (Typeable, Semigroup)
+                 deriving (Typeable, Data, Semigroup)
 instance AttributeClass TailSize
 
 type instance V TailSize = R2
@@ -328,13 +326,10 @@ instance Default TailSize where
 
 -- | Set the radius of a circumcircle around the arrow tail.
 tailSize :: (HasStyle a, V a ~ R2) => Measure Double -> a -> a
-tailSize = applyTAttr . TailSize . Last
-
-setTailSize :: (Measure Double) -> Style R2 -> Style R2
-setTailSize = setAttr . TailSize . Last
+tailSize = applyGTAttr . TailSize . Last
 
 tailSizeA :: (HasStyle a, V a ~ R2) => TailSize -> a -> a
-tailSizeA = applyTAttr
+tailSizeA = applyGTAttr
 
 getTailSize :: TailSize -> Measure Double
 getTailSize (TailSize (Last s)) = s
diff --git a/src/Diagrams/TwoD/Text.hs b/src/Diagrams/TwoD/Text.hs
index 5a29c041..c0fe02a9 100644
--- a/src/Diagrams/TwoD/Text.hs
+++ b/src/Diagrams/TwoD/Text.hs
@@ -23,7 +23,7 @@ module Diagrams.TwoD.Text (
   -- ** Font family
   , Font(..), getFont, font
   -- ** Font size
-  , FontSize(..), getFontSize, fontSize, fontSizeA, setFontSize
+  , FontSize(..), getFontSize, fontSize, fontSizeA
   -- ** Font slant
   , FontSlant(..), FontSlantA, getFontSlant, fontSlant, italic, oblique
   -- ** Font weight
@@ -37,13 +37,9 @@ import           Diagrams.Core.Style    (setAttr)
 import           Diagrams.TwoD.Types
 
 import           Data.AffineSpace       ((.-.))
-
 import           Data.Semigroup
-
 import           Data.Colour
-
 import           Data.Default.Class
-
 import           Data.Typeable
 
 ------------------------------------------------------------
@@ -177,8 +173,6 @@ instance Default FontSize where
 getFontSize :: FontSize -> Measure Double
 getFontSize (FontSize (Last s)) = s
 
-setFontSize :: (Measure Double) -> Style R2 -> Style R2
-setFontSize = setAttr . FontSize . Last
 -- | Set the font size, that is, the size of the font's em-square as
 --   measured within the current local vector space.  The default size
 --   is @1@.