\begin{tikzpicture}
	\draw (-1,0)--(2,0);
	\draw (2,0)--++(1,1)--++(1,-1);
	\draw (2,0)--++(1,-1)--++(1,1);
	\draw (4,0)--++(3,0);
	
	\draw (3,1)[red, thick] arc
	[
	start angle=90,
	end angle=180,
	x radius=2cm,
	y radius =1cm
	];
	\draw (3,-1)[red, thick] arc
	[
	start angle=270,
	end angle=360,
	x radius=2cm,
	y radius =1cm
	];
	\draw (3,-1)[blue, thick] arc
	[
	start angle=270,
	end angle=180,
	x radius=1.25cm,
	y radius =1cm
	];
	\draw (3,1)[blue, thick] arc
	[
	start angle=90,
	end angle=0,
	x radius=1.25cm,
	y radius =1cm
	];
	\draw (0.35,0)[black, thick] arc
	[start angle=0, end angle=360, radius = 0.25cm];
	\draw (-0.25,0)[black, thick] arc
	[start angle=0, end angle=360, radius = 0.25cm];
	\draw (6,0)[black, thick] arc
	[start angle=0, end angle=360, radius = 0.25cm];
	\draw (6.5,0)[black, thick] arc
	[start angle=0, end angle=360, radius = 0.25cm];
	
	\draw[dashed] (-1,-2)--(-1,2);
	\draw[dashed] (4.6,-1.5)--(4.6,1.5);
	\draw[dashed] (7,-2)--(7,2);
	
	\draw[latex-latex] (-1, 2)--(7,2);
	\draw(3, 2)node[above]{$\eta^+_{a,c}$};
	\draw[latex-latex] (-1, -2)--(7,-2);
	\draw(3, -2)node[below]{$\eta^-_{a,c}$};
	
	\draw[latex-latex] (-1, 1.5)--(4.6,1.5);
	\draw(1.5, 1.5)node[below]{$\eta^+_{a,b}$};
	\draw[latex-latex] (4.6, 1.5)--(7,1.5);
	\draw(5.8, 1.5)node[below]{$\eta^+_{b,c}$};
	
	\draw[latex-latex] (-1, -1.5)--(4.6,-1.5);
	\draw(1.5, -1.5)node[above]{$\eta^-_{a,b}$};
	\draw[latex-latex] (4.6, -1.5)--(7,-1.5);
	\draw(5.8, -1.5)node[above]{$\eta^-_{b,c}$};
	
	\draw[circle,fill](-1,0)circle[radius=1mm];
	\draw(-1,0)node[left]{$a$};
	\draw[circle,fill](4.6,0)circle[radius=1mm];
	\draw(4.6,0)node[above right]{$b$};
	\draw[circle,fill](7,0)circle[radius=1mm];
	\draw(7,0)node[right]{$c$};
\end{tikzpicture}