Montpellier have the 17th Heineken Cup's "little and large" and the Ospreys have the tournament's "youngest and oldest" pair. View the squads of all 24 Clubs exclusively on ercrugby.com
From over 900 players registered for the 2011 / 2012 competition, Montpellier's France A lock Aliki Kakate weighs in at a mighty 140kgs (22st 1lb) while the club's scrum half Benoit Paillaugue is exactly half the weight at just 70kgs (11st 0lbs).
Click here to visit Montpelllier's Squad Page and then follow the Logos to other squads
The Ospreys' double features former Wales hooker Mefin Davies set to start his 15th season of European club rugby at 39-years-old while his team-mate Sam Davies has just celebrated his 18th birthday.
Elsewhere, Leinster's double Heineken Cup final winning lock Devin Toner, again looks down on the rest from his 2.10 metres with Castres Olympique scrum half Romain Teulet looking up at the rest from his 1.63 metres.
THE TALLEST
Devin Toner Leinster 2.10m / 6ft 11in
Richie Gray Glasgow Warriors 2.05m / 6ft 9in
Alastair Kellock Glasgow Warriors 2.05m / 6ft 9in
THE SHORTEST
Romain Teulet Castres Olympique 1.63m / 5ft 4in
Kyle Eastmond Bath Rugby 1.67m / 5ft 5in
Brendan Williams Benetton Treviso 1.69m / 5ft 6in
THE HEAVIEST
Aliki Kakate Montpellier 140kgs / 22st 1lb
Benjamin Sa Racing Metro 92 136kgs / 21st 6lbs
Soane Tonga'uiha Northampton Saints 132kgs / 20st 11lbs
Matteo Muccignat Benetton Treviso 132kgs / 20st 11lbs
THE LIGHTEST
Benoit Paillaugue Montpellier 70kgs / 11st 0lbs
Nicolas Bezy Toulouse 70kgs / 11st 0lbs
Yann Lesgourgues Biarritz Olympique 70kgs / 11st 0lbs
THE OLDEST
Mefin Davies Ospreys 02.09.72 (39 years and 69 days at 10.11.11)
Julian White Leicester Tigers 14.05.73
John Hayes Munster 02.11.73
THE YOUNGEST
Sam Davies Ospreys 06.10.93 (18 years and 35 days at 10.11.11)
Rhodri Williams Scarlets 05.05.93
Kyle Sinckler Harlequins 30.03.93